Precision Digital Corporation ProtEX-MAX PD8-6080 User manual

ProtEX-MAX PD8-6080/PD8-6081 Modbus®Scanners
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel [phone]
www.predig.com
•Fully Approved Explosion-Proof Modbus®Scanners
•Modbus®RS-485 RTU Scanner as Master, Slave, or Snooper
•Dual Analog Inputs (0-20 mA, 4-20 mA, 0-5 V, 1-5 V, and ±10 V)
•On-Board USB & RS-485 Serial Communication Standard
•Decimal or Feet & Inches (with Eighths & Sixteenths) Display Options
•Poll and Display up to 16 Process Variables
•Add, Diff, Avg, Multi, Div, Min, Max, Weighted Avg, Ratio, Concentration, & More
•Dual-Line 6-Digit Display, 0.6" (15 mm) & 0.46" (12 mm)
•SafeTouch Through-Glass Button Programming
•Display Mountable at 0°, 90°, 180°, & 270°
•4 Relays with Interlocking Capability + Isolated 4-20 mA Output Option
•Password Protection
•Free PC-Based, On-Board, ScanView USB Programming Software
•SunBright Display Standard Feature; Great for Outdoor Applications
•Operating Temperature Range: -55 to 65°C (-67 to 149°F)
•CSA Certified as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
•ATEX and IECEx Certified as Flame-Proof
•Input Power Options: 85-265 VAC / 90-265 VDC or 12-24 VDC / 12-24 VAC
•Multi-Pump Alternation Control
•32-Point, Square Root, or Exponential Linearization
•Flanges for Wall or Pipe Mounting
•Explosion-Proof Aluminum or Stainless Steel NEMA 4X / IP68 Enclosures
•Four 3/4" NPT Threaded Conduit Openings
•Pipe Mounting Kits
•Stainless Steel Tag Available
•3-Year Warranty

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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Disclaimer
The information contained in this document is
subject to change without notice. Precision Digital
makes no representations or warranties with
respect to the contents hereof and specifically
disclaims any implied warranties of
merchantability or fitness for a particular purpose.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
•Read complete instructions prior to installation
and operation of the meter.
•Risk of electric shock or personal injury.
•This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
•Failure to follow installation guidelines could
result in death or serious injury. Make sure only
qualified personnel perform the installation.
•Never remove the meter cover in explosive
environments when the circuit is live.
•Cover must be fully engaged to meet
explosion-proof/dust-ignition-proof/flame-proof
requirements.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2023 Precision Digital Corporation.
All rights reserved.
FREE ScanView
Programming Software
The scanner can be powered from the USB connection. When
using the USB connection, DO NOT apply AC or DC power to
the scanner.
The easiest and quickest way to program your
ProtEX-MAX Modbus scanner is to use the FREE
ScanView programming software. This software is
loaded into the scanner and connects and installs
directly to your PC with a USB cable. We recommend
that the first thing you do after taking the Modbus
scanner out of the box is connect it to your PC with
the provided USB cable –do not use a different cable.
DO NOT apply AC or DC power to the scanner while
your PC is connected to the scanner as it will disrupt
the USB connection.
ScanView programming software is intuitive, and
most customers can get their scanner programmed as
they like without even looking in the manual.
For more information on ScanView visit
www.predig.com/ScanView
In addition to programming, the software may be used
for:
•Monitoring
•Datalogging using your PC
•Generating and saving programming files for
later use
Once your Modbus scanner is programmed the way
you want it, you can wire it up for your application per
the instructions in this manual and install it. If you find
that you need to make adjustments to the
programming after the scanner is installed, you can
use the programming buttons and the instructions in
this manual to do so.
•When using the USB connection, the meter
should only be connected to a computer when
both devices are in a non-hazardous area.

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Table of Contents
Introduction......................................................................................................... 8
Ordering Information.......................................................................................... 8
Key Features....................................................................................................... 9
Specifications................................................................................................... 16
General.......................................................................................................... 16
Operating Modes.......................................................................................... 16
Master & Snooper Settings ......................................................................... 17
PV Settings ................................................................................................... 17
Display Settings ........................................................................................... 17
Math Functions............................................................................................. 17
Serial Communications ............................................................................... 18
Dual Process Inputs..................................................................................... 18
Relays............................................................................................................ 19
Isolated 4-20 mA Output.............................................................................. 19
USB Connection........................................................................................... 20
Digital Input (F4)........................................................................................... 20
Digital Inputs & Outputs .............................................................................. 20
ScanView Software ...................................................................................... 20
Enclosure...................................................................................................... 21
General Compliance Information.................................................................... 21
Electromagnetic Compatibility.................................................................... 21
Product Ratings and Approvals.................................................................. 22
EU Declaration of Conformity.......................................................................... 23
Safety Information............................................................................................ 23
Installation.......................................................................................................... 23
Mounting....................................................................................................... 24
Installation Overview ................................................................................... 26
ScanView Software ...................................................................................... 26
Transmitter Supply Voltage Selection (P+, P-) .......................................... 28
Connections ................................................................................................. 28
Required & Factory Wired Connection....................................................... 28
PROVUElectronics Module Layout............................................................. 29
USB Connection ........................................................................................ 29
Power Connections.................................................................................... 30
RS-485 Connections.................................................................................. 31
RS-485 Multi-Drop Connection.................................................................. 31
Digital I/O Connections .............................................................................. 31
F4 Digital Input Connections...................................................................... 31
Relay Connections..................................................................................... 32
Interlock Relay Feature.............................................................................. 32
Switching Inductive Loads.......................................................................... 32
4-20 mA Output Connections..................................................................... 33
Analog Output Power Supply..................................................................... 33
Remote Programming................................................................................ 33
Analog Input Signal Connections............................................................... 34
Setup and Programming.................................................................................. 35
Overview....................................................................................................... 35
LED Status Indicators.................................................................................. 35
Programming Buttons ................................................................................. 37
SafeTouch Buttons ...................................................................................... 37
Display Functions & Messages................................................................... 38
Menu Navigation Tip.................................................................................... 41
Setting Numeric Values............................................................................... 41
Main Menu..................................................................................................... 41
Serial Communications (serial)................................................................ 42
Scanner Mode Selection.............................................................................. 43
Operating Modes (nmode).......................................................................... 43
How to Enable Process Variables (PVs)..................................................... 43
Master Mode (nmastr)............................................................................... 44
Snooper Mode (Snoopr)............................................................................ 45
How to Select 5 or 6-Digit Registers........................................................... 46
Slave Mode (SlaVe)................................................................................... 46

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
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Setting Up the Scanner (setup)................................................................... 47
Setting Up the Process Variables (PVs) (pV setup)................................. 48
Setting the Display Decimal Point (disp.dp)............................................... 49
Setting the Float Decimal Point (Flot..dp)................................................... 49
Scaling the PV Display Values (sCale) ..................................................... 49
Setting Up the Displays (dsplay setup).................................................... 50
Display Line 1 Parameters (Line 1 dsplay)............................................ 50
Display Line 2 Parameters (Line 2 dsplay)............................................ 50
Display Intensity (d-IntY).......................................................................... 50
Display Line 1 Menu (Line 1 dsplay)..................................................... 51
Display Line 2 Menu (Line 2 dsplay)..................................................... 52
Setting the Tags (tAg) & Units (units)..................................................... 53
Application Example 1 ............................................................................... 53
Application Example 2 ............................................................................... 55
Setting the Relay Operation (relay)........................................................... 56
Relay Setup Menu (relay setup)............................................................ 56
Setting the Relay Action (act 1) ............................................................... 57
Programming Set and Reset Points........................................................... 57
Setting Fail-Safe Operation (failsf) ........................................................ 57
Programming Time Delay (delay)............................................................. 57
Relay Action for Communications Break (break) ...................................... 57
Relay Action for Loss of 4-20 mA Input (Loop Break)................................ 58
Time Delay Operation................................................................................ 58
Relay Sampling Operation......................................................................... 58
Relay and Alarm Operation Diagrams........................................................ 59
High Alarm Operation (Set > Reset)............................................................. 59
Low Alarm Operation (Set < Reset)........................................................... 59
High Alarm with Fail-Safe Operation (Set > Reset).................................... 59
Low Alarm with Fail-Safe Operation (Set < Reset)..................................... 59
Pump Alternation Control Operation.......................................................... 60
Relay Operation After Communications Break........................................... 60
Relay Operation Details............................................................................... 61
Overview.................................................................................................... 61
Relays Auto Initialization............................................................................ 61
Fail-Safe Operation (failsf)..................................................................... 61
Front Panel LEDs....................................................................................... 61
Latching and Non-Latching Relay Operation ............................................. 61
Non-Latching Relay (Auto)........................................................................ 62
Non-Latching Relay with Manual Reset (A-nman)...................................... 62
Latching Relay (LatcH).............................................................................. 62
Latching Relay with Clear (Lt-Clr)........................................................... 62
Acknowledging Relays............................................................................... 63
Pump Alternation Control Applications (Altern) ....................................... 63
Setting Up the Interlock Relay (Force On) Feature.................................... 64
Scaling the 4-20 mA Analog Output (Aout)................................................ 64
Setting Up the Password (pass).................................................................. 65
Protecting or Locking the Scanner............................................................. 65
Making Changes to a Password Protected Scanner.................................. 65
Disabling Password Protection .................................................................. 65
Advanced Features Menu............................................................................ 66
Advanced Menu Navigation Tips ............................................................... 66
Advanced Features Menu & Display Messages......................................... 66
Scan Function (SCan)................................................................................. 68
Manual Control Menu (Contrl) ................................................................. 69
Noise Filter (filter) ................................................................................. 70
Noise Filter Bypass (bypass)..................................................................... 70
Rounding Feature (round)......................................................................... 70
Select Menu (SELect)................................................................................ 70
Low-Value Cutoff (CutofF)........................................................................ 78
Analog Output Source Programming (aoutpr).......................................... 78
Programmable Function Keys User Menu (user)...................................... 80
Digital Input Menu (dI 1)........................................................................... 81
Digital Output Menu (dO 1)........................................................................ 81
Reset Menu (reset).................................................................................. 81
Input Calibration (ICAL).............................................................................. 82
Recalibrating the Analog Input Channels (Ch-A & Ch-B)........................... 82

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Scanner Operation ........................................................................................... 83
Button Operation.......................................................................................... 83
SafeTouch Buttons ...................................................................................... 83
Function Keys Operation............................................................................. 84
Digital Inputs Operation............................................................................... 84
Maximum/Minimum Readings..................................................................... 84
Troubleshooting............................................................................................... 84
Diagnostics Menu (diag)............................................................................. 84
Testing the Display LEDs........................................................................... 84
Determining Software Version ................................................................... 85
Reset Scanner to Factory Defaults............................................................. 85
Factory Defaults & User Settings............................................................... 85
Troubleshooting Tips................................................................................... 87

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Table of Figures
Figure 1. Enclosure Dimensions –Front View............................................... 24
Figure 2. Enclosure Dimensions –Side Cross Section View ....................... 24
Figure 3. Transmitter Supply Voltage Selection ............................................ 28
Figure 4. Integrated PROVURequired Connections....................................... 28
Figure 5. PROVUElectronics Module Layout.................................................. 29
Figure 6. USB Connection ............................................................................... 29
Figure 7. Power Connections.......................................................................... 30
Figure 8. RS-485 Diagnostic LEDs.................................................................. 31
Figure 9. Three-Wire RS-485 Connection....................................................... 31
Figure 10. Digital Input and Output Connections .......................................... 31
Figure 11. F4 Digital Input Connections......................................................... 31
Figure 12. Relay Connections ......................................................................... 32
Figure 13. Interlock Connections.................................................................... 32
Figure 14. AC and DC Loads Protection......................................................... 32
Figure 15. Low Voltage DC Loads Protection................................................ 32
Figure 16. 4-20 mA Output Connections ........................................................ 33
Figure 17. Analog Output Supply Powering Other Devices.......................... 33
Figure 18. Transmitter Powered by External Power Supply......................... 34
Figure 19. Self-Powered Transmitters ............................................................ 34
Figure 20. 2-Wire Voltage Input Connections ................................................ 34
Figure 21. 3-Wire Voltage Input Connections ................................................ 34

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
8
Introduction
The ProtEX-MAX PD8-6080 and PD8-6081
Explosion-Proof Modbus Scanners can be
programmed as a Master, Slave, or Snooper. Their
primary use is to scan and display up to 16 Modbus
registers or two 4-20 mA inputs in place of two
Modbus registers.
In Master mode, the ProtEX-MAX reads up to 16
slave devices. In Snooper mode, the scanner listens
to the Modbus traffic and picks up a specific register
or registers being polled by a master device from a
specific slave device and process the data being
read. In Slave mode, the scanner is controlled by a
master device. In all modes, the data sent to the
scanner is displayed, and used to operate the relays
and 4-20 mA output.
The scanners are capable of polling up to 16 process
variables (PVs) and displaying them in sequence at a
user programmable scan rate.
A fully loaded ProtEX-MAX scanner comes with four
SPDT relays, a 4-20 mA output, five digital inputs and
four digital outputs, and RS-485 serial
communications.
Free ScanView software allows the ProtEX-MAX
Modbus Scanner to be accessed via a computer.
It can be used to configure multiple scanners,
conveniently monitor critical information, and data log
right from a PC.
SafeTouch Buttons
To make it possible to program and operate the
ProtEX-MAX in a hazardous area, the programming
buttons that are located behind the glass window can
be operated without removing the cover by using the
SafeTouch through-glass buttons. The operator puts
their finger on the glass over the button and the
button is actuated.
To learn more about SafeTouch buttons,
see this video:
predig.com/videos/Safetouch_Buttons
Ordering Information
Aluminum Enclosure
85-265 VAC Models
Model
Standard Features
Options Installed
Decimal Display
PD8-6080-6H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-6H7
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-6H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-6H7
4 relays
4-20 mA output
12-24 VDC Models
Model
Standard Features
Options Installed
Decimal Display
PD8-6080-7H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-7H7
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-7H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-7H7
4 relays
4-20 mA output
Stainless Steel Enclosure
85-265 VAC Models
Model
Standard Features
Options Installed
Decimal Display
PD8-6080-6H0-SS
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-6H7-SS
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-6H0-SS
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-6H7-SS
4 relays
4-20 mA output
12-24 VDC Models
Model
Standard Features
Options Installed
Decimal Display
PD8-6080-7H0-SS
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-7H7-SS
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-7H0-SS
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-7H7-SS
4 relays
4-20 mA output
Accessories
Model
Description
PDA0001
3/4" M-NPT to F-M20 Reducer
PDA0002
3/4" M-NPT to 1/2" F-NPT Reducer
PDAPLUG75
3/4" Metal Conduit/Stopping Plug
PDA-SSTAG
Custom Stainless Steel Tag (see
website for convenient ordering form)
PDA6848
2" U-Bolt Kit Zinc Plated Steel
PDA6848-SS
2" U-Bolt Kit Stainless Steel
PDA7485-I
RS-232 to RS-485 isolated converter
PDA8485-I
USB to RS-485 isolated converter

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Key Features
Connections for PD8-6080-6H7, PD8-6081-6H7, PD8-6080-7H7 & PD8-6081-7H7
The Only Explosion-Proof Modbus Scanner You Will Ever Need
Front, back and in between, the PD8-6080 and PD8-6081
ProtEX-MAX Explosion-proof Modbus scanners boast
specifications, features and functionality that make
them the only hazardous area Modbus scanners you
will ever need. They can scan up to 16 process variables
made up of Modbus registers or two analog signals
such as 4-20 mA. The PD8-6080 displays in decimal
format, while the PD8-6081 has a feet & inches
display.
These Modbus scanners can be operated in Master,
Slave or Snooper modes. In Master mode, the
ProtEX-MAX reads up to 16 slave devices, scales the
data from each, displays the result, and operates the
internal relays and 4-20 mA output. As a Snooper, the
scanners listen to the Modbus traffic and pick up a
specific register or registers being polled by a master
device from a specific slave device and process the
data being read. In Slave mode, the scanner is
controlled by a master device. The data sent to the
scanner by the master is scaled, displayed, and used
to operate the relays and 4-20 mA output.
The first thing you notice about the PD8-6000 is its
modern looking, rugged, explosion-proof housing with
convenient mounting flanges, available in aluminum
or stainless steel. Housed inside this enclosure is a
dual-line, 6-digit display with high-intensity LEDs that
can be read in direct sunlight. The main line can
display numbers up to 999,999 and the second line
can be used to indicate a tag or display the input in
another scale. The front panel push-buttons can even
be operated in a hazardous area without removing the
cover by using the SafeTouch through-glass feature.
Various math functions may be applied to the Modbus
and analog inputs as well as signal conditioning
functions such as square root extraction, programmable
exponent, or round horizontal tank calculations. The
displays, relays, and the analog outputs may be
assigned to PVs or to math channels C1, C2, C3, or
C4. All these features and capabilities can easily be
programmed without removing the cover using
SafeTouch buttons in a hazardous area or with free
ScanView PC-based software in a safe area.
•Form C (SPDT) relays
•Removable terminal blocks
•4 relays + isolated 4-20 mA
output option
•Universal 85-265 VAC or
12/24 VDC input power
•Voltage or current inputs
•No jumpers needed for
V/mA input selection
•Digital input (F4)

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Modbus Capabilities
There are three operating modes for the Modbus
scanners:
Master
Processes data read from Modbus RTU slave
devices. It polls up to 16 process variables from 1 to
16 slave devices. The Master is capable of scanning
the selected PVs, scaling the data, triggering relays,
performing math operations, and driving the analog
outputs.
Snooper
Listens to the Modbus traffic and picks up a specific
register or registers being polled by a master device
from a specific slave device and processes the data
being read. The Snooper mode handles the data the
same way as the Master.
Slave
Processes data sent to it from a Modbus RTU master
device.
Possible applications include:
•Use Master Mode to scan the top level, interface
level, and temperature from Modbus multivariable
level transmitters.
•Use Master Mode to display the flow rate, tag,
and units, for multiple Modbus-enabled flow
meters.
•Use Snooper Mode to add a tank side indicator at
eye-level for a Modbus level transmitter being
polled by a master in the control room.
•Use Snooper Mode to add additional remote
displays to a network with a Modbus scanner
acting as the master and display the data at all
operator locations.
•Use Slave Mode to display data sent to the
scanner by a Modbus master in the control room.
Modbus Scanner Video
Learn more about the Modbus scanners in this short
video.
https://www.predig.com/videos/dD6BGcKUwuc

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Multivariable Level Transmitters Application
In this application we have a system consisting of four multivariable tank level gauges connected to a PD8-6080-6H7
displaying product level, interface level, and average temperature. The PD8-6080 is setup for Master mode, and it is
polling the Modbus transmitters.
Snooper Displaying Flow Rate from Modbus Flow Meters
In this application we have a system consisting of two Modbus enabled flowmeters connected to a SCADA system
operated out of a control room. A Modbus PLC polls the data out of the flowmeters. A PD8-6080-6H7 has been
added to the system as a Modbus Snooper, to provide the operators an easy-to-read field display near the flow lines.
The scanner displays one flow rate on the main display, and one on the second display. Each has an alternating tag
and units for clear identification.
Local Display with PD8-6080
in Snooper Mode Displaying
2 PVs Simultaneously
PLC Master in
Control Room
←Modbus RS-485 →
Modbus Flowmeter #1
Modbus Flowmeter #2

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
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Powerful Math Functions
The PD8-6080 & PD8-6081 use up to 16 process
variables in a variety of powerful math functions
designed for process applications. Programmable
Adder (P) and Factor (F) constants allow each
formula to be customized as needed for a specific
application. The Math Channels (C1-C4) may be
displayed in many useful combinations. Most math
functions may be applied to all PVs: for example, it is
possible to add up to 16 PVs and calculate the total
volume of all the tanks in a field. The Math2 function
allows for further calculations on the results of other
math channels (e.g. C4= C2/C1).
Name
Function
Setting
Addition
C1=(PV1+PV2+P)*F
Sunm
Difference
C1=(PV1-PV2+P)*F
diF
Absolute
Difference
C1=((Abs(PV1- PV2)+P)*F
diFAbS
Average
C1=(((PV1+PV2)/2)+P)*F
AvG
Multiplication
C1=((PV1*PV2)+P)*F
nmulti
Division
C1=((PV1/PV2)+P)*F
divide
Maximum PV
Maximum value of all selected PVs
Hi-Pv
Minimum PV
Minimum value of all selected PVs
Lo-Pv
Draw
C1=((PV1/PV2)-1)*F
drAuw
Weighted
Average
C1=((PV2-PV1)*F)+PV1
uw avg
Ratio
C1=(PV1/PV2)*F
ratio
Concentration
C1=(PV1/(PV1+PV2))*F
Concen
Resultant
Math
Channel
Math on all other math channels
nmath2
Addition
C3=(C1+C2+P)*F
Sunm
Difference
C4=(C1-C2+P)*F
diF
Absolute
Difference
C3=((Abs(C1- C2)+P)*F
diFAbS
Average
C4=(((C1+C2)/2)+P)*F
AvG
Multiplication
C3=((C1*C2)+P)*F
nmulti
Division
C4=((C1/C2)+P)*F
divide
Note: The F constant can be any value from 0.00001 to
999999. If the value is less than 1, it will have the same
effect as a divider. For example, the average could also be
derived by using (A+B)*F, where F = 0.500.
Automatic or Manual Scanning
The scanner may automatically or manually cycle
through the PVs. The scanner can be programmed to
display each PV for 1 to 99.9 seconds. The NEXT and
PREV buttons can be used to manually scan to the
next or previous PV display. The SCAN button will
pause and resume automatic scanning.
Easy Programming Methods
Given the nature of Modbus applications and the
flexibility and feature-rich capabilities of the Modbus
scanners, there is a considerable amount of
programming required to get them going. Luckily,
there is free PC-based software called ScanView that
makes it very quick and easy to program the Modbus
scanners. The scanners can also be programmed
using the through-glass SafeTouch buttons. This
makes it easy to make small changes to the setup
once the instrument is installed in the hazardous area.
Once programming is completed, it can be locked
with a password.
The ProtEX-MAX also comes preloaded with the free
ScanView programming software that connects and
installs directly to your PC with a standard USB cable,
also provided free with each instrument. This
eliminates the need to insert CDs, install drivers, or
download software from the internet. When you
connect your ProtEX-MAX to your PC, ScanView is
downloaded to your PC, the software automatically
selects the model you are programming, and you’re
ready to start programming immediately. Further
simplifying the programming process, the ProtEX-MAX
can be powered from the USB port, so no need to
apply external power while programming your meter.
In addition to programming, the software will also
allow you to monitor and datalog a ProtEX-MAX using
your PC. You can also generate and save
programming files for later use.

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
13
Physical Features
The ProtEX-MAX is designed for ease-of-use in safe
and hazardous area applications, and is housed in a
rugged NEMA 4X explosion-proof enclosure,
available in either aluminum or stainless steel. The
ProtEX-MAX can operate over a wide temperature
range (-55° to 60°C / -67° to 140°F), includes
removable screw terminal connectors, can have up to
four relays and a 4-20 mA output, and features
through‑glass buttons for easy meter operation
without the need to remove the cover. All of these
features are backed by a 3-year warranty.
Super-Bright LED Display
The ProtEX-MAX features a dual-line 6-digit display
with super-bright LEDs, our brightest ever. These
allow the display to be read in any lighting condition,
even in direct sunlight.
SafeTouch Through-Glass Buttons
The ProtEX-MAX is equipped with four sensors that
operate as through-glass buttons so that it can be
programmed and operated without removing the
cover (and exposing the electronics) in a hazardous
area. These buttons can be disabled for security by
selecting the DISABLE setting on the NO-CONTACT
BUTTONS switch located on the back of the
electronics module, inside the enclosure.
Rugged, Heavy-Duty Enclosure
The ProtEX-MAX is housed in a rugged NEMA 4X, 7,
& 9, IP68 aluminum or stainless steel enclosure,
designed to withstand harsh environments in safe and
hazardous areas.
Wide Viewing Angle
Customers can’t always look at the display from
straight on, so the window and display module have
been optimized to provide a wide viewing angle of
approximately ±40°; nearly twice that of the
competition.
Built-In Mounting Flanges
The ProtEX-MAX is equipped with two slotted flanges
for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm
pipe mounting.
Flexible Mounting & Wiring
The ProtEX-MAX features four ¾" NPT threaded
conduit openings so that wiring can be routed to the
most convenient conduit connection(s).

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
14
Rotatable Display
The ProtEX-MAX rotatable display, along with four
available conduit connections, provide for numerous
installation options. The display can be rotated in 90°
increments. Rotate it 90° for horizontal mounting.
Vertical Mounting Horizontal Mounting
Perfect & Secure Fit Every Time
The internal cast rails ensure the ProtEX-MAX
assembles together perfectly, quickly and securely;
and everything lines up for optimal viewing every
time. There are no standoffs to worry about breaking
or getting out of alignment. Two spring-loaded,
self-retaining, thumbscrews make the assembly a
snap, while pressing the display as close to the glass
as possible to improve wide angle viewing.
Stainless Steel Tags
PDA-SSTAG is a laser etched stainless steel tag
accessory for any of your Precision Digital meters.
The tag features custom text for equipment
identification, instruction, or whatever else is needed
in your facility. Each tag comes with a stainless steel
wire and lead seal for easy mounting wherever you
need it.
Removable Screw Terminals
Industrial applications require screw terminal
connections for easy field wiring and the ProtEX-MAX
goes one step further in convenience by making them
removable also.
Note: The above photograph is representative of the back of
the PD8-6080 and PD8-6081 in every regard except for the
signal input connector. See Figure 5 on page 29 for actual
input signal connections.
USB Port ScanView
Hazardous Area Approvals
The ProtEX-MAX is certified by CSA as
Explosion-Proof / Dust-Ignition-Proof / Flame-Proof,
and is ATEX and IECEx certified as Dust-Ignition-
Proof / Flame-Proof.
Wide Operating Temperature Range
The ProtEX-MAX can operate from -55 to 60°C
(-67 to 140°F) meaning it can be installed in a wide
variety of indoor and outdoor industrial applications.
USB cable conveniently
plugs into side of
ProtEX-MAX meter

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
15
Useful Tools
PD9501 Multi-Function Calibrator
This PD9501 Multi-Function Calibrator has a variety
of signal measurement and output functions, including
voltage, current, thermocouple, and RTD.
PD9502 Low-Cost Signal
Generator
The PD9502 is a low-cost, compact, simple to use
4-20 mA or 0-10 VDC signal generator. It can easily
be set for 0-20 mA, 4-20 mA, 0-10 V or 2-10 V
ranges. Signal adjustment is made with a one-turn
knob. A 15-27 VDC wall plug is provided with the
instrument. Optional USB power bank is available.

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
16
Specifications
Except where noted all specifications apply to
operation at +25°C.
General
Input/output
Modbus RTU over RS-485
Two analog inputs (4-20 mA, 10 V)
Display
Display Line 1: 0.60" (15 mm) high,
red LEDs
Display Line 2: 0.46" (12 mm) high,
red LEDs
6 digits each (-99999 to 999999),
with lead zero blanking
Display
Intensity
Eight user selectable intensity levels.
Default value is six.
LED Status
Indicators
See LED Status Indicators on page 35 for
details.
Overrange
Display flashes 999999
Underrange
Display flashes -99999
Programming
Methods
Four SafeTouch through-glass buttons
when cover is installed. Mechanical buttons
can be used with the cover removed. Free
PC-based USB ScanView programming
software.
Max/Min
Display
Max/min readings are stored until reset by
the user or when power to the scanner is
turned off. User can reset by front panel
pushbuttons, digital input, or via Modbus
registers.
Rounding
Select 1, 2, 5, 10, 20, 50, or 100
(e.g. rounding = 10, value = 123.45,
display = 123.50)
Password
Three programmable passwords restrict
modification of programmed settings.
Pass 1: Allows use of function keys and
digital inputs
Pass 2: Allows use of function keys, digital
inputs and editing set/reset points
Pass 3: Restricts all programming, function
keys, and digital inputs
Non-Volatile
Memory
All programmed settings are stored in
non-volatile memory for a minimum of ten
years if power is lost.
Power
Options
85-265VAC50/60Hz;90-265VDC,20Wmax;
12-24 VDC, 12-24 VAC, 15 W max.
Powered over USB for configuration only.
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 scanners may
share one 5 A fuse
Isolation
4 kV input/output-to-power line
500 V input-to-output or output-to-P+ supply
Overvoltage
Category
Installation Overvoltage Category II: Local
level with smaller transient overvoltages
than Installation Overvoltage Category III.
Environmental
T6 Class operating temperature range
Ta = -55 to 60ºC
T5 Class operating temperature range
Ta = -55 to 65ºC
Storage temperature range:
-55 to 85ºC (-67 to 185ºF)
Relative humidity:
0 to 90% non-condensing
Max Power
Dissipation
Maximum power dissipation limited to 15.1 W
Connections
Power, signal, relays, mA out: Removable
screw terminal blocks accept 12 to 22
AWG wire
RS-485: Removable screw terminal block
accepts 16 to 30 AWG wire
Digital I/O: Removable screw terminal
blocks accept 16 to 30 AWG wire
Mounting
Wall Mounting:
Four (4) mounting holes provided for
mounting meter to wall. See Wall
Mounting Instructions on page 23 for
additional details.
Pipe Mounting:
Optional pipe mounting kit (PDA6848)
allows for pipe mounting. Sold separately.
See Pipe Mounting Instructions on page 25
for additional details.
Tightening
Torque
Screw terminal connectors:
5 lb-in (0.56 Nm)
Overall
Dimensions
6.42" x 7.97" x 8.47" (W x H x D)
(163 mm x 202 mm x 215 mm)
Weight
Aluminum: 14.7 lbs (6.67 kg)
Stainless Steel: 23.5 lbs (10.66 kg)
Warranty
3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.
Operating Modes
Master
Processes data read from Modbus RTU
slave devices. It polls up to 16 process
variables from 1 to 16 slave devices. The
Master is capable of scanning the selected
PVs, scaling the data, triggering relays,
performing math operations, and driving
the analog outputs.
Snooper
Listens to the Modbus traffic and picks up
a specific register or registers being polled
by a master device from a specific slave
device and processes the data being read.
The Snooper mode handles the data the
same way as the Master.
Slave
Processes data sent to it from a Modbus
RTU master device.
Note: The relays and the 4-20 mA outputs are functional in
all modes.

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
17
Master & Snooper Settings
PV Number
PV1–PV16 Enable or disable the process
variables to be polled by the Master.
Slave Id
Assign the slave ID or address (1-247,
256-259 for mA or volts inputs) containing
the process variables to be displayed by
the selected PV.
Function
Code
Select which Modbus function code (03, 04,
or 65) to use in reading the slave device.
Register
Number
5 digit:30001-39999, 40001-49999,or1-65,536
6 digit: 300001-365536 or 400001-465536
(Function Code 65 N/A here)
Specifies which register(s) to read in the
slave device. Range is dependent on
Function Code selection (65, 04, or 03) and
digits selection (5 or 6).
Data Type
Select the data format that the slave device
uses. Select between Short integer (2 byte),
Long integer (4 byte), or floating point
(4 byte), Signed or Unsigned (integer only)
and byte order: 1234, 4321, 2143, or 3412
(big-endian vs. little-endian, or swapped).
Poll Time
1.0 to 99.9 sec. Time between
read-commands (Master mode).
Slave
Response
Timeout
0.0 to 99.9 seconds: Time allowed for the
slave to respond before the scanner
generates a communication break condition.
The master polls the slave 3 times before
starting the response timeout timer.
Slave/Snooper mode: Time the scanner will
wait for new data before going into break
condition.
Slave mode: Programming 0 disables the
timeout; the last value received will be
displayed indefinitely.
Communica-
tion Break
Displays brEAK after the Master has polled
the slave device 3 times and the response
timeout has elapsed. The Snooper and Slave
modes go into break condition after no new
data is received withinthe response timeout
window. Relays can be programmed to go on,
off, or ignore the break condition. The analog
outputs can be setup to generate a fixed mA
current when a break condition is detected.
PV Settings
Tag & Units
6-character, independent tag and units for
each PV and math channel
PV Format
PD8-6080 default: Decimal format
PD8-6081 default: FT & IN, 1/8th or 1/16th;
decimal format may be selected for line 2
indication.
Display
Decimal
Point
Up to five decimal places or none:
d.ddddd, dd.dddd, ddd.ddd, dddd.dd,
ddddd.d,or dddddd
Float
Decimal
Point
Select the number of decimals to use for
the floating point data expected from the
slave or master device (this is independent
from the display decimal point selection).
PV & Math
Scaling
All PVs and math channels may be scaled
to represent the input data in any
engineering unit.
Example: Level transmitter = 999.999
inches; to display in Ft-In-1/16th scale input
2 to display 83 Ft –4 In –0/16th.
Display Settings
Scan Mode
Automatic: 1.0 to 99.9 sec
Manual: Front panel or digital inputs
Go on alarm: Continues scanning after an
alarm is detected
Stop on alarm: Goes to the alarmed PV
and stops scanning; press Scan to resume
scanning.
Display
Scan Rate
Master/Snooper: 1 PV/second to 1 PV
every 99.9 seconds
Slave: Dependent on master device
(e.g. PLC)
Note: The display scan rate is independent
of the poll time.
Display
Assignment
Display line 1:
PV, Ch-C (math channel), PV & units,
tag & PV, tag-PV-units, Ch-C & units,
tag-Ch-C-unit, set points, max/min PV,
max/min Ch-C
Display line 2:
Same as Display Line 1; plus units, tag or
turned off
The tag and units are displayed alternately
for 2 seconds max, when selected.
Different tags & PVs may be selected to
display on line 1 & 2 at the same time
Math Functions
Name
Math Operation (Examples)
(P = Adder, F = Factor)
Setting
Addition
(PV1+PV2+P)*F
Sunm
Difference
(PV1-PV2+P)*F
diF
Absolute
difference
((Abs(PV1- PV2)+P)*F
diFAbS
Average
(((PV1+PV2)/2)+P)*F
AvG
Multiplication
((PV1*PV2)+P)*F
Nmulti
Division
((PV1/PV2)+P)*F
divide
Max PV
Max value of all selected PVs
Hi-pv
Min PV
Min value of all selected PVs
Lo-pv
Draw
((PV1/PV2)-1)*F
drAuw
Weighted
average
((PV2-PV1)*F)+PV1
uwavg
Ratio
(PV1/PV2)*F
Ratio
Concentration
(PV1/(PV1+PV2))*F
Concen
Math 2
Math on other math channels
Nmath2
Programmable
Constants
Constant P (Adder): -99.999 to 999.999,
default: 0.000
Constant F (Factor): 0.001 to 999.999,
default: 1.000

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
18
Serial Communications
Compatibility
EIA-485
Connectors
Removable screw terminal connector
Max Distance
3,937' (1,200 m) max
Status
Indication
Separate LEDs for Power (METER LINK),
Transmit (TX), and Receive (RX)
Scanner ID
1 –247 (Scanner Modbus address)
Baud Rate
300 –19,200 bps
Transmit
Time Delay
Programmable 0 to 4999 ms
This is the time the scanner will wait for a
slave to respond before sending another
request on the bus. This value should be
greater than 100 ms to avoid collisions on
the bus.
Data
8 bits (1 start bit, 1 or 2 stop bits)
Parity
Even, Odd, or None with 1 or 2 stop bits
Byte-To-Byte
Timeout
0.01 –2.54 second
Turn Around
Delay
Less than 2 ms (fixed)
Note: Refer to the ProtEX-MAX Scanner Modbus Register
Tables located at www.predig.com for details.
Dual Process Inputs
Two Inputs
Two non-isolated analog inputs,
independent field selectable:
0-20 mA, 4-20 mA; 10 V (0-5, 1-5, 0-10 V)
Isolated
Transmitter
Power Supply
Terminals P+ & P-: 24 VDC ± 10%.
Isolated from the input at >500 V and from
the power line at 4 kV. Jumper selectable
for 24, 10, or 5 VDC supply (internal
jumper J4). All models transmitter supply
rated @ 25 mA max.
PV Analog
Channel ID
Ch-A mA: Assign PV to ID 256 or
Ch-A volt: 257;
Ch-B mA: Assign PV to ID 258 or
Ch-B volt: 259
Accuracy
±0.03% of calibrated span ±1 count,
square root & programmable exponent
accuracy range: 10-100% of calibrated
span
Temperature
Drift
0.005% of calibrated span/C max from
0 to 65C ambient,
0.01% of calibrated span/C max from
-40 to 0C ambient
Input Signal
Conditioning
Linear, square root, programmable
exponent, or round horizontal tank volume
calculation
Multi-Point
Linearization
2 to 32 points for PV1 and PV2
Programmable
Exponent
User selectable from 1.0001 to 2.9999 for
open channel flow
Round
Horizontal
Tank
Diameter & Length: 999.999 inch or cm
calculates volume in gallons or liters
respectively.
Low-value
Cutoff
0.1 to 999,999 (0 disables cutoff function)
for PV1 and PV2. Point below at which
display always shows zero.
Calibration
Range
Input Range
Minimum Span
Input 1 & Input 2
4-20 mA
0.15 mA
10 V
0.10 V
An error message will appear if the input 1
& input 2 signals are too close together.
Input
Impedance
Voltage ranges: greater than 500 k
Current ranges: 50 - 100 (depending on
internal resettable fuse impedance)
Input
Overload
Current input protected by an internal
resettable fuse, 30 VDC max. Fuse resets
automatically after fault is removed.
HART
Transparency
The scanner can support ONLY one HART
loop on either of the inputs. A signal
isolator is required if two HART loops are
being connected.
Under the described conditions, the
scanner does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The scanner is not
affected if a HART communicator is
connected to the loop. The scanner does
not display secondary HART variables.

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
19
Relays
Rating
4 SPDT (Form C) internal and rated 3 A
@ 30 VDC and 125/250 VAC resistive load;
1/14 HP (≈50 W) @ 125/250 VAC for
inductive loads
Noise
Suppression
Noise suppression is recommended for
each relay contact switching inductive
loads to prevent disruption to the
microprocessor’s operation. Recommended
suppressor value: 0.01 µF/470 , 250 VAC
(PDX6901). See Switching Inductive Loads
on page 32 for details.
Deadband
0-100% of span, user programmable
High or Low
Alarm
User may program any alarm for high or
low trip point. Unused alarm LEDs and
relays may be disabled (turn off).
Relay
Operation
•Automatic (non-latching) and/or
manual reset
•Latching (requires manual
acknowledge) with or without clear
•Pump alternation control (2-4 relays)
•Sampling (based on set point and time)
•Off (disable unused relays and enable
Interlock feature)
•Manual on/off control mode
Relay Reset
(Acknowledge)
User selectable via front panel button,
F4 digital input, external contact closure on
digital inputs, or through serial
communications.
Time Delay
0 to 999.9 seconds, on & off relay time
delays. Programmable and independent for
each relay
Fail-Safe
Operation
Programmable and independent for each
relay.
Note: Relay coil is energized in non-alarm
condition. In case of power failure, relay will
go to alarm state.
Auto
Initialization
When power is applied to the scanner,
relays will reflect the state of the input to
the scanner.
Isolated 4-20 mA Output
Output Source
PV1-16, math channels C1-4,
set points 1-4, or manual control mode
Scaling Range
1.000 to 23.000 mA for any display range
Calibration
Factory calibrated:
4.000 to 20.000 = 4-20 mA output
Analog Out
Programming
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and
break
Communica-
tions Break
Programmable mA output when a slave
device does not reply within the response
timeout.
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/C max from 0 to 65C ambient,
0.8 µA/C max from -40 to 0C ambient.
Note: Analog output drift is separate from
input drift.
Isolated
Transmitter
Power Supply
Terminals I+ & R: 24 VDC 10%.
Used to power the 4-20 mA output.
All models rated @ 25 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply
Minimum
Maximum
24 VDC
10 
700 
35 VDC (external)
100 
1200 

ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus®Scanners
Instruction Manual
20
USB Connection
Function
Programming only
Connector Type
Micro-B receptacle
Cable
USB A Male to Micro-B Cable
Driver
Microsoft®Windows®XP/Vista/7/8/10
Power
USB port provides power to the
scanner.
DO NOT apply AC or DC power to the
scanner while the USB port is in use.
Digital Input (F4)
Function
Remote operation of front-panel buttons,
acknowledge/reset relays, reset max/min
values. See Function Keys & Digital I/O
Available Settings on page 80 for a
complete list of capabilities.
Contacts
3.3 VDC on contact. Connect normally
open contacts across F4 to COM.
Logic Levels
Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC
Digital Inputs & Outputs
Function
Terminals provided for remote operation of
all four programming / operation buttons.
Other uses include acknowledge/reset
relays and reset max/min values. See
Function Keys & Digital I/O Available
Settings on page 80 for a complete list of
capabilities.
Channels
4 digital inputs & 4 digital outputs
Digital Input
Logic High
3 to 5 VDC
Digital Input
Logic Low
0 to 1.25 VDC
Digital Output
Logic High
3.1 to 3.3 VDC
Digital Output
Logic Low
0 to 0.4 VDC
Source
Current
10 mA maximum output current
Sink Current
1.5 mA minimum input current
+5 V Terminal
To be used as pull-up for digital inputs only.
Connect normally open push buttons
across +5 V & DI 1-4.
•DO NOT use +5 V terminal to power external
devices.
ScanView Software
Availability
Download directly from scanner or from
www.predig.com/download_software
System
Requirements
Microsoft®Windows®XP/Vista/7/8/10
Communications
USB 2.0 (for programming only)
(USB A Male to Micro-B Cable)
RS-485 to USB converter
(programming, monitoring, and data
logging)
Configuration
Configure scanners one at a time
Power
USB port provides power to the
scanner.
DO NOT apply AC or DC power to the
scanner while the USB port is in use.