Watlow PM PLUS 6 User manual

1241 Bundy Boulevard., Winona, Minnesota USA 55987
Phone: [phone], Fax: [phone]
http://www.watlow.com
TOTAL
3 Year Warranty
CUSTOMER
SATISFACTION
Registered Company
Winona, Minnesota USA
ISO 9001
6
PID/Integrated Controller
User's Guide
Made in the U.S.A.
10-40670
December, 2019

Watlow PM PLUS™ 6 • 2 •
Safety Information
We use note, caution and warning symbols throughout this book to draw your attention to
important operational and safety information.
• A “NOTE” marks a short message to alert you to an important detail.
• A “CAUTION” safety alert appears with information that is important for protecting your
equipment and performance. Be especially careful to read and follow all cautions that apply to your application.
• A “WARNING” safety alert appears with information that is important for protecting you,
others and equipment from damage. Pay very close attention to all warnings that apply to your application.
• The safety alert symbol, (an exclamation point in a triangle) precedes a general
CAUTION or WARNING statement.
• The electrical hazard symbol, (a lightning bolt in a triangle) precedes an electric shock hazard CAUTION or
WARNING safety statement. Further explanations follow:
Symbol Explanation
CAUTION – Warning or Hazard that needs further explanation than label on unit
can provide. Consult User's Guide for further information.
ESD Sensitive product, use proper grounding and handling techniques when
installing or servicing product.
Unit protected by double/reinforced insulation for shock hazard prevention.
Do not throw in trash, use proper recycling techniques or consult manufacturer
for proper disposal.
Enclosure made of Polycarbonate material. Use proper recycling techniques or
consult manufacturer for proper disposal.
Unit can be powered with either alternating current (ac) voltage or direct current
(dc) voltage.
Unit is a Listed device per Underwriters Laboratories®. It has been evaluated to
United States and Canadian requirements for Process Control Equipment.
UL®61010 and CSA C22.2 No. 61010. File E185611 QUYX, QUYX7.
See: www.ul.com
Unit is a Listed device per Underwriters Laboratories®. It has been evaluated
to United States and Canadian requirements for Hazardous Locations Class
1 Division II Groups A, B, C and D. ANSI/ISA 12.12.01-2007. File E184390
QUZW, QUZW7. See: www.ul.com

Watlow PM PLUS™ 6 • 3 •
Unit is compliant with European Union directives. See Declaration of Conformity for
further details on Directives and Standards used for Compliance.
Unit has been reviewed and approved by Factory Mutual as a Temperature Limit
Device per FM Class 3545 standard. See: www.fmglobal.com
Unit has been reviewed and approved by CSA International for use as Temperature
Indicating-Regulating Equipment per CSA C22.2 No. 24. See: www.csa-international.
org
Unit has been reviewed and approved by ODVA for compliance with DeviceNet
communications protocol. See: www.odva.org
Unit has been reviewed and approved by ODVA for compliance with Ethernet/IP
communications protocol. See: www.odva.org
Warranty
The PM PLUS is manufactured by ISO 9001-registered processes and is backed by a three-year warranty to
the first purchaser for use, providing that the units have not been misapplied. Since Watlow has no control
over their use, and sometimes misuse, we cannot guarantee against failure. Watlow's obligations hereunder,
at Watlow's option, are limited to replacement, repair or refund of purchase price, and parts which upon
examination prove to be defective within the warranty period specified. This warranty does not apply to
damage resulting from transportation, alteration, misuse or abuse. The purchaser must use Watlow parts to
maintain all listed ratings.
Technical Assistance
If you encounter a problem with your Watlow controller, review your configuration information to verify that your
selections are consistent with your application: inputs, outputs, alarms, limits, etc. If the problem persists, you can
get technical assistance from your local Watlow representative (see back cover), by e-mailing your questions to
[email protected] or by dialing [phone] between 7 a.m. and 5 p.m., Central Standard Time
(CST). Ask for an Applications Engineer. Please have the following information available when calling:
• Complete model number
• All configuration information
• User’s Guide
• Factory Page
Return Material Authorization (RMA)
1. Using the form found on watlow.com/rma, submit a request for a Return Material Authorization (RMA)
number before returning any item for repair. If you do not know why the product failed, contact an
Application Engineer. All RMA’s require:
• Ship-to address
• Bill-to address
• Contact name

Watlow PM PLUS™ 6 • 4 •
• Phone number
• Method of return shipment
• Your P.O. number
• Detailed description of the problem
• Any special instructions
• Name and phone number of person returning the product.
2. Prior approval and an RMA number from the Customer Service Department is required when returning any
product. Make sure the RMA number is on the outside of the carton and on all paperwork returned. Ship on a
Freight Prepaid basis.
3. After we receive your return, we will examine it to verify the reason for the product failure. Unless otherwise
agreed to in writing, Watlow's standard warranty provisions, which can be located at www.watlow.com/terms,
will apply to any failed product.
4. In the event that the product is not subject to an applicable warranty, we will quote repair costs to you and
request a purchase order from you prior to proceeding with the repair work.
5. Watlow reserves the right to charge for no trouble found (NTF) returns.
Third Party License Guide
Introduction
PM PLUS incorporates certain third party software within the product. The license terms associated with
this software require we give copyright and license information and this Third Party License Terms List
("TPLTL") provides those details.
Fonts
Roboto
Copyright (C) 2008 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
an "AS IS" BASIS, WITHOUT WARRANTIES or CONDITIONS OF ANY KIND, either express or implied. See the License
for the specific language governing permissions and limitations under the License.
The PM Plus product firmware contains the Roboto Font. PM Plus product firmware is Copyright (C) 2019 Watlow
Electric Controls, Inc.
This PM PLUS User’s Guide is copyrighted by Watlow Electric, Inc., © December 2019 with all rights reserved.

Watlow PM PLUS™ 6 • 5 • Table of Contents
Table of Contents
Chapter 1: Overview .......................................9
Introduction ......................................................9
Standard Features and Benefits .......................................9
PM PLUS™ Operational Overview ....................................11
Inputs ......................................................11
Internal Functions .............................................11
Outputs .....................................................11
Configuration and Monitoring of Features Through Lists ...............12
Profiles .....................................................12
System Diagrams .................................................13
Chapter 2: Installation .....................................17
Installing the Device ...............................................17
Wiring Your New PM PLUS™ .......................................18
Isolation Block Diagram ............................................20
Chapter 3: User Interface ...................................38
Touch Keys ......................................................38
Home Screen ....................................................38
Default Home Screen Parameters .................................38
Active Messages on the Home Screen .................................39
Chapter 4: Operations .....................................40
Operations List ...................................................40
Default Operations Parameters/Sublists ............................40
Adding Custom Parameters to the Operations List ...................42
Chapter 5: Setup .........................................44
Default Configurations for Quick Start .................................44
Configuring Parameters.........................................44
Using Watlow Software to Configure Parameters .....................44
Setup List .......................................................45
Analog Input List..............................................45
Digital Bus List ...............................................47
Linearization List ..............................................49
Process Value List.............................................50
Digital Input/Output List ........................................51
Limit List ....................................................52
Control Loop List..............................................53

Watlow PM PLUS™ 6 • 6 • Table of Contents
Output List...................................................56
Alarm List ...................................................57
Current List ..................................................59
Timer List ...................................................59
Math List ....................................................60
Special Output Function ........................................61
Function Key .................................................62
Global List ...................................................62
Communications List...........................................64
Changing PM PLUS™ to PM PLUS™ Express ...........................67
How to Enact PM PLUS™ Express.............................67
Revert from PM Express to Original Configuration ................68
Saving and Restoring Settings .......................................68
Reset Original Factory Settings ...................................68
Chapter 6: Profiles .......................................69
Setting Up Global Features ..........................................69
Setting Up Profiles ...............................................69
Starting a Profile..................................................70
Configuring the Function Key to Start and Stop a Profile ...............70
Configuring a Digital Input to Start and Stop a Profile .................70
Profile List ......................................................71
Chapter 7: Factory List.....................................74
Chapter 8: Features.......................................77
Autotune........................................................77
TRU-TUNE+®.................................................78
Input Features....................................................79
Calibration Offset..............................................79
Calibration of Analog Inputs .....................................81
Filter Time Constant ...........................................82
Sensor Backup ...............................................83
Set Minimum Set Point and Maximum Set Point .....................83
Scale High and Scale Low ......................................83
Range High and Range Low .....................................84
Remote Set Point .............................................84
Ten Point Linearization .........................................85
Output Features ..................................................85
Duplex ......................................................85
NO-ARC Relay ................................................85
Retransmitting a Process Value or Set Point. . . . . . . . . . . . . . . . . . . . . . . . . 86
Cool Output Curve.............................................87
Resetting a Tripped Limit .......................................87

Watlow PM PLUS™ 6 • 7 • Table of Contents
Control Methods..................................................88
Output Configuration...........................................88
Auto (closed loop) and Manual (open loop) Control...................88
On-Off Control................................................89
Proportional and (P) Control.....................................90
Proportional and Integral (PI) Control..............................90
Proportional, Integral and Derivative (PID) Control....................91
Dead Band...................................................91
Variable Time Base ............................................92
Single Set Point Ramping .......................................92
Compressor Control ...........................................93
Differential Control ............................................94
Ratio Control .................................................94
Duplex Control................................................94
Motorized Valve Control ........................................94
Timer Function ...................................................94
Alarms .........................................................96
Process and Deviation Alarms....................................96
Set Points ...................................................96
Hysteresis ...................................................97
Latching.....................................................97
Silencing Alarms ..............................................98
Blocking Alarms ..............................................98
Current Sensing ..................................................98
Open and Shorted Load Circuit Detection ...........................98
Open Loop Detection...........................................99
Programming the Function Key ......................................99
Security Features .................................................99
Read Lock and Set Lock Levels...................................99
Passwords..................................................101
Modbus®- Using Programmable Memory Blocks .......................102
CIP Communications: DeviceNet or EtherNet/IP.........................103
CIP Implicit Assemblies........................................103
Compact Assembly Class...................................104
Modifying Implicit Assembly Members ........................104
PCCC - (Programmable Controller Communications Commands) ..........104
Profibus DP (Decentralized Peripherals) ..............................105
Chapter 9: Applications ...................................106
Example 1: Single Loop Control .....................................106
Example 2: Sensor Backup.........................................106
Example 3: Square Root...........................................107
Example 4: Ratio.................................................107
Example 5: Differential ............................................108
Example 6: Wet Bulb / Dry Bulb .....................................109

Watlow PM PLUS™ 6 • 8 • Table of Contents
Example 7: Vaisala ...............................................109
Example 8: Motorized Valve Control..................................110
Chapter 10: Appendix ....................................112
Troubleshooting Alarms, Errors and Control Issues......................112
Modbus®Programmable Memory Blocks .............................117
CIP Implicit Assemblies ...........................................120
Compact Class Assembly Structure ..................................122
PM PLUS™ Integrated PID Configuration Options .......................129
PM PLUS™ PID Configuration Options ...............................130
Specifications ...................................................131

Watlow PM PLUS™ 6 • 9 • Chapter 1 Overview
Chapter 1: Overview
Introduction
Watlow’s PM PLUS™ has an intuitive interface with a smooth touch keypad for easy programming and read-
ability. This reduces complexity at the front of the control. Using Composer or Configurator is highly desir-
able to program the PM. The PM PLUS™ is compatible with legacy EZ-ZONE PM controllers and connects via
Bluetooth®to our EZ-LINK™ mobile app for remote access configuration and monitoring, if Bluetooth®was
ordered in the Part number.
The PM PLUS™ can be ordered as a PID controller or an integrated controller with multiple functions
combined. Look for the device configuration code on the product label to confirm which functional options are
included on your device. Upon power up, you can see the firmware revision and Bluetooth®logo, if enabled, on
the device display and if Bluetooth®is part of the Part number.
Standard Features and Benefits
Intuitive list flow
• Reduces menu structure to a list of lists for easy configuration
• Offers easy to read characters and color coding for a display visible from many angles
• Reduces setup time and increases operator efficiency
Smooth touch keypad
• Eliminates contamination points on the front of the controller and creates better seal
• No mechanical components to wear out, easy to clean
Bluetooth
®
compatible with EZ-LINK™ mobile app
• Provides full descriptions of parameters and error codes
• Allows remote access capabilities without the use of cables or converters
• Provides the ability to configure the product and save parameter sets, except for Factory parameters and Profile
parameters.
High amperage integrated PID and limit controller
• Reduces wiring time and termination complexity compared with connecting other products
• Decreases component count and required panel space
• Increases user and equipment safety for over/under temperature conditions
• Drives 15 ampere resistive loads directly
Standard Bus Communications with Configuration Software
• Includes Watlow standard bus communications used by COMPOSER
®
or CONFIGURATOR
®
software
Serial communication capabilities
• Provides a wide range of protocol choices including Modbus
®
RTU, EtherNet/IP™, Modbus
®
TCP, PROFIBUS DP,
DeviceNet™ and J1939 CAN bus
• Supports network connectivity to a PC or PLC for remote set point adjustment

Watlow PM PLUS™ 6 • 10 • Chapter 1 Overview
Enhanced control options
• Handles complex process problems such as ratio, differential, square-root, motorized valve control without
slidewire feedback, wet-bulb/dry-bulb, compressor control and peltier loads
• Provides batch process control
• Supports set point change during countdown 10-point linearization curve
• Improves sensor accuracy
Current monitoring
• Detects heater current flow and provides alarm upon a failed output device or heater load
• Drives output on open or shorted heater
Advanced PID control algorithm
• Offers TRU-TUNE
®
+ adaptive control for demanding applications
• Provides auto-tune for fast, efficient start-up
Built-in sensor compensation curves
• Includes Vaisala RH and altitude (pressure) curves
Profile capability
• Offers pre-programmed process control with ramp/soak programming with 40 total steps
Retransmit output
• Supports industry needs for recording
Factory Mutual (FM) approved over/under limit with auxiliary outputs
• Increases user and equipment safety for over/under temperature conditions
Memory for saving and restoring parameter settings
• Decreases service calls and time down
Agency approvals
• UL
®
listed, CSA, CE, RoHS, W.E.E.E., FM, SEMI F47-0200, Class 1, Div. 2 rating on some models
Touch-safe package
• Increases safety for installer/operator
• Complies with IP2X requirements
Programmable function key
• Enables simple, one-touch operation of user-defined, repetitive activities

Watlow PM PLUS™ 6 • 11 • Chapter 1 Overview
PM PLUS™ Operational Overview
The PMPLUS receives Information from an input, performs an internal function as a response to that input,
then causes a resulting output. All of these - the inputs, the internal functions, and the outputs - are
configurable. A single PM PLUS™ can carry out several functions at the same time, such as PID control, check-
ing for a limit condition, monitoring for several alarm situations, etc.
You may configure up to four profiles to automate a sequence of up to ten steps per profile, to further
customize and extend the application of the device.
Inputs
Inputs provide the information a programmed procedure can act upon. A basic example is a sensor monitoring
the temperature of a part being heated or cooled. Each analog input typically uses a thermocouple or RTD to
read the process temperature or the volts, current or resistance from various devices.
Optional digital input/output (DIO) hardware can be used as either an input or an output. Each DIO must be
configured as either an input or output. A digital input allows for a specific function to occur. The Function Key
can also be programmed to allow for a specific function to occur.
Internal Functions
A function is a user-programmed internal process that uses input signals to calculate a value and then perform
an action, i.e.:
• Compare an input value to the set point and calculate the optimal power for a heater
• Detect a failure of the primary sensing device and trip a contactor to remove power from the heating
element
• When a digital input signal changes, allows for a specific function to occur.
• Evaluate an incoming temperature to determine an alarm state (on or off)
Each internal function is associated with one source, or instance. For example, a control equipped with DIO,
can be configured to respond to one of the four alarms.
Outputs
Outputs are functions or actions configured to respond to information provided by an internal function. Some
output examples are: removal of the control voltage to a contactor; operating a heater, turning a light on or off,
unlocking a door, etc.
You can assign outputs to any input, and may assign more than one output to respond to a single instance of a
function. For example, alarm 2 could be used to trigger a light connected to output 1 and a siren connected to
DIO 5.

Watlow PM PLUS™ 6 • 12 • Chapter 1 Overview
Configuration and Monitoring of Features Through Lists
PM PLUS™ features and parameters are structured in lists that you can access via the smooth-touch key
interface on the front panel for easy configuration and monitoring. You can also access lists remotely if you
prefer, using our EZ-LINK app or our CONFIGURATOR software.
List Description
Operations List This list is used to monitor or change runtime settings such as the high set point of the
limit, or monitor things like the time remaining in a profile step. It is also used to access
the main configuration lists referenced here.
Setup List This is used prior to operation to set up equipment related settings such as input type
and output cycle time.
Profile List If equipped with this feature you will use this list to configure up to 4 profiles with up to
ten steps each.
Factory List This list doesn't affect runtime operations. It is used to adjust hardware settings like
passwords or the appearance of the Home Screen, or to view the control part number.
Profiles
A profile is a sequence of steps. When a profile runs, the controller automatically executes its steps in se-
quence. The step type determines what action the controller performs. Steps can change temperatures and
other process values gradually over time, maintain temperatures and process values for specific periods, or
repeat a sequence of steps numerous times. At each step the profile can activate or deactivate outputs that
control other equipment. Also a step can have the controller wait for specific conditions before proceeding such
as, waiting for a switch closure and/or a specific process value to be detected by a sensor.
Input Events and Output Events
When a Profile step is programmed as a "Wait For Event Input" will wait for the "Input Event" to be in the proper
state before it will proceeds to the next step of a Profile. Event Outputs will allow you to turn "On" or "Off", or
"leave as is"; in each step of a Profile.

Watlow PM PLUS™ 6 • 13 • Chapter 1 Overview
System Diagrams
Current Monitoring - with Current Transformer, without Communications Card
• Detects heater current flow
• Provides an alarm indication of a failed-load issue.
Note:
Number of inputs and outputs and various combinations of the same will vary
depending upon part number; see ordering matrix for more detail.
Function Key
Programmable Event
Digital Output (or Input) 5 & 6
(optional) none, switched dc
Digital Input (or Output) 5 & 6
(optional) none, switch, volts dc
Current
Transformer
Board
(optional)
Slot B
Inputs Outputs
- None
- Idle set point
- Tune
- Alarm clear, request
- Force alarm
- Silence alarm
- Manual/auto mode
- Control outputs off
- Remote set point
enable
- Lock keypad
- TRU-TUNE+
®
disable
- Loop & alarms off
- Profile disable
- Profile hold/resume
- Profile start
- Profile start/stop
- Restore user settings
- Event inputs
Analog Input 1
none, Thermocouple, RTD (100Ω,
1kΩ), Thermistor 5kΩ, 10kΩ, 20kΩ,
40kΩ) Process (V, mV, mA) or 1k
Potentiometer
Output 1
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 2
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)
Analog Input 2
Current Transformer
PID
Controller
(Optional -
Ramp/Soak max 4
files, 40 steps)
Slot A
(Optional)
Input Sensor
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, event
Modbus
Address
1 - 247
Standard Bus
Zone Address
1 - 16
Supervisory &
Power Board
Slot C
Current
Transformer
EIA-485 Communication
Standard Bus
(optional Modbus RTU)
RUI, Controllers,
PLC, PC or HMI
Output 3
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 4
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)

Watlow PM PLUS™ 6 • 14 • Chapter 1 Overview
Remote Set Point Operation With Auxillary Input, Without Communications Card
• Remote Set Point Operation supports efficient set point manipulation from a remote device, such as a
master control or PLC.
Note:
Number of inputs and outputs and various combinations of the same will vary
depending upon part number; see ordering matrix for more detail.
Function Key
Programmable Event
Digital Output (or Input) 5 & 6
(optional) none, switched dc
Digital Input (or Output) 5 & 6
(optional) none, switch, volts dc
Auxillary
Input
(optional)
Slot B
Input
Functions
Output
Functions
- None
- Idle set point
- Tune
- Alarm clear, request
- Force alarm
- Silence alarm
- Manual/auto mode
- Control outputs off
- Remote set point
enable
- Lock keypad
- TRU-TUNE+
®
disable
- Loop & alarms off
- Profile disable
- Profile hold/resume
- Profile start
- Profile start/stop
- Restore user settings
- Event inputs
Analog Input 1
none, Thermocouple, RTD (100Ω,
1kΩ), Thermistor 5kΩ, 10kΩ, 20kΩ,
40kΩ) Process (V, mV, mA) or 1k
Potentiometer
Output 1
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 2
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)
PID
Controller
(Optional -
Ramp/Soak max 4
files, 40 steps)
Slots A
(Optional)
Input Sensor
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, event
Modbus
Address 1 - 247
Standard Bus
Zone Address
1 - 16
Supervisory &
Power Board
Slot C
EIA-485 Communication
Standard Bus
(optional Modbus RTU)
RUI, Controllers,
PLC, PC or HMI
Output 3
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 4
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)
Analog Input 2
none, CT, Thermocouple, RTD (100
Ω, 1kΩ), Thermistor 5kΩ, 10kΩ,
20kΩ, 40kΩ) Process (V, mV, mA)
or 1k Potentiometer
Input Sensor

Watlow PM PLUS™ 6 • 15 • Chapter 1 Overview
Integrated PID and Limit Controller with Limit, Without Communications Card
• Reduces wiring time and termination complexity compared to connecting separate products
• Reduces panel space
• Reduces installation costs
• Increases dependability with backup control sensor operation
• Increases user and equipment safety for over-under temperature conditions
Note:
Number of inputs and outputs and various combinations of the same will vary
depending upon part number; see ordering matrix for more detail.
Function Key
Programmable Event
Digital Output (or Input) 5 & 6
(optional) none, switched dc
Digital Input (or Output) 5 & 6
(optional) none, switch, volts dc
Limit Controller
Board
(optional)
Slot B
Input
Functions
Output
Functions
- None
- Limit reset
- Idle set point
- Tune
- Alarm clear, request
- Force alarm
- Silence alarm
- Manual/auto mode
- Control outputs off
- Remote set point
enable
- Lock keypad
- TRU-TUNE+®disable
- Loop & alarms off
- Profile disable
- Profile hold/resume
- Profile start
- Profile start/stop
- Restore user settings
- Event inputs
Analog Input 1
none, Thermocouple, RTD (100Ω,
1kΩ), Thermistor 5kΩ, 10kΩ, 20kΩ,
40kΩ) Process (V, mV, mA) or 1k
Potentiometer
Output 1
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 2
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)
PID
Controller
(Optional -
Ramp/Soak max 4
files, 40 steps)
Slots A
(Optional)
Input Sensor
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, retransmit,
duplex or event
Limit
off, heat, cool
alarm, event
Modbus
Address 1 - 247
Standard Bus
Zone Address
1 - 16
Supervisory &
Power Board
Slot C
EIA-485 Communication
Standard Bus
(optional Modbus RTU)
RUI, Controllers,
PLC, PC or HMI
Output 3
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 4
5A mechanical relay (form A)
Analog Input 2
none, CT, Thermocouple, RTD (100
Ω, 1kΩ), Thermistor 5kΩ, 10kΩ,
20kΩ, 40kΩ) Process (V, mV, mA)
or 1k Potentiometer
Input Sensor
If Limit, this output must
be Limit

Watlow PM PLUS™ 6 • 16 • Chapter 1 Overview
Expanded Serial Communications
• Supports network connectivity to a PC or PLC
• Available in a wide range of protocol choices, including Modbus
®
RTU, EtherNet/IP™, Modbus
®
TCP
Function Key
Programmable Event
Digital Output (or Input) 5 & 6
(optional) none, switched dc
Digital Input (or Output) 5 & 6
(optional) none, switch, volts dc
Input
Functions
Output
Functions
- None
- Idle set point
- Tune
- Alarm clear, request
- Force alarm
- Silence alarm
- Manual/auto mode
- Control outputs off
- Remote set point
enable
- Lock keypad
- TRU-TUNE+
®
disable
- Loop & alarms off
- Profile disable
- Profile hold/resume
- Profile start
- Profile start/stop
- Restore user settings
- Event inputs
Analog Input 1
none, CT, Thermocouple, RTD (100
Ω, 1kΩ), Thermistor 5kΩ, 10kΩ,
20kΩ, 40kΩ) Process (V, mV, mA)
or 1k Potentiometer
Output 1
none, switched dc/open collector, 5A
mechanical relay (form C), process
(V, mA), or 0.5A SSR (form A)
Output 2
none, 15A NO-ARC, switched dc,
5A mechanical relay (form A), or
0.5A SSR (form A)
PID
Controller
(Optional -
Ramp/Soak max 4
files, 40 steps)
Slot A
(Optional)
Input Sensor
off, heat, cool
alarm, retransmit,
duplex, event
off, heat, cool
alarm, event
off, heat, cool
alarm, event
EIA-485 Communication
Standard Bus
(optional Modbus RTU)
RUI, Controllers,
PLC, PC or HMI
Communications
EIA 232/485 Modbus RTU/TCP,
EtherNet/IP, DeviceNet, Profibus
Modbus Address
1 - 247
Standard Bus
Zone Address
1 - 16
Supervisory &
Power Board
Slot C
Communications
Board
Slot B

Watlow PM PLUS™ 6 • 17 • Chapter 2: Installation
Chapter 2: Installation
Installing the Device
1. Make the panel cutout using the measurements shown here. We recommend a minimum of 21.6 mm
between panel cutouts.
2. Remove the green terminal connectors and the mounting collar assembly.
3. Insert the controller into the panel cutout from the front.
4. Orient the collar base so the flat side faces front and the screw openings are on the sides, then slide the base
over the back of the controller.
5. Slide the mounting bracket over the controller with the screws aligned to the collar base.
6. Push the bracket gently but firmly until the hooks snap into the slots in the case.
7. Tighten the two #6-19 x 1.5" screws with a Phillips screwdriver until the device is flush to the panel
(3 to 4 in-lbs torque).
8. Secure screws from the back with Philips screwdriver.
Reinstall the terminal connectors to their original locations. (Or first connect field wiring as indicated in this
guide and then reinstall the connectors).
n/a
n/a
PM6 Refresh Layout
Pape 4-15-2019
D
C
B
A
A
B
C
D
MATERIAL
SHT
1
OF
1
1
2
3
4
5
6
7
8
87654321
SCALE
PART NO.
DWN
TITLE
MFG
ENG
PRCH
FINISH
WATLOW OF WINONA, MINNESOTA, CLAIMS PROPRIETARY RIGHTS TOTHE MATERIAL HEREIN DISCLOSED.
IT IS SUPPLIED IN CONFIDENCE, WITHOUT PREJUDICE TO ANY PATENT RIGHTS OF WATLOW ELECTRIC, AND MAY NOT
BE REPRODUCED OR USED TO MANUFACTURE ANYTHING SHOWN THEREIN WITHOUT WATLOW'S WRITTEN PERMISSION.
NOTICE TO PERSONS RECEIVING THIS DRAWING
1241 BUNDY BLVD., P.O. BOX 5580
WINONA, MN 55987-5580
www.watlow.com
PM6 Final
1:1
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS AND TOLERANCING ARE IN INCHES
AND PER ANSI Y14.5M
TOLERANCES:
X.X ā0.015
X.XX ā0.010
X.XXX ā0.005
ANGLES ā2Ā
THIRD ANGLE
PROJECTION
TITLE BLOCK: temp_b, Rev D
REVISION
REV. DESCRIPTION DATE ECO
1PROTO XX/XX/20XX -
2 Updated 5/31/2019 --
2.10 in.
(53.3 mm)
2.10 in.
(53.3 mm)
Mounting Panel
4.164 in.
(105.8 mm)
0.4 in.
(10.2 mm)
n/a
n/a
PM6 Refresh Layout
Pape 4-15-2019
D
C
B
A
A
B
C
D
MATERIAL
SHT
1
OF
1
1
2
3
4
5
6
7
8
87654321
SCALE
PART NO.
DWN
TITLE
MFG
ENG
PRCH
FINISH
WATLOW OF WINONA, MINNESOTA, CLAIMS PROPRIETARY RIGHTS TOTHE MATERIAL HEREIN DISCLOSED.
IT IS SUPPLIED IN CONFIDENCE, WITHOUT PREJUDICE TO ANY PATENT RIGHTS OF WATLOW ELECTRIC, AND MAY NOT
BE REPRODUCED OR USED TO MANUFACTURE ANYTHING SHOWN THEREIN WITHOUT WATLOW'S WRITTEN PERMISSION.
NOTICE TO PERSONS RECEIVING THIS DRAWING
1241 BUNDY BLVD., P.O. BOX 5580
WINONA, MN 55987-5580
www.watlow.com
PM6 Final
1:1
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS AND TOLERANCING ARE IN INCHES
AND PER ANSI Y14.5M
TOLERANCES:
X.X ā0.015
X.XX ā0.010
X.XXX ā0.005
ANGLES ā2Ā
THIRD ANGLE
PROJECTION
TITLE BLOCK: temp_b, Rev D
REVISION
REV. DESCRIPTION DATE ECO
1PROTO XX/XX/20XX -
2 Updated 5/31/2019 --
2.10 in.
(53.3 mm)
2.10 in.
(53.3 mm)
Mounting Panel
4.164 in.
(105.8 mm)
0.4 in.
(10.2 mm)
• This equipment is suitable for use in Class 1, Div. 2, Groups A, B, C
and D or Non-Hazardous locations only. Temperature Code T4A. Note:
Class 1, Div 2 is only valid if the last 2 characters in the part # are "12".
• EXPLOSION HAZARD. Substitution of component may impair
suitability for Class 1, Div. 2.
• EXPLOSION HAZARD. Do not disconnect equipment unless power has
been switched off or the area is known to be nonhazardous.

Watlow PM PLUS™ 6 • 18 • Chapter 2: Installation
Wiring Notes
Maximum wire size termi-
nation and torque rating:
0.0507 to 3.30 mm2 (30
to 12 AWG) single-wire
termination or two 1.31
mm2 (16 AWG)
0.56 Nm (5.0 in-lb.)
torque
Adjacent terminals may
be labeled differently
depending on the model
number.
Do not connect wires to
unused terminals.
Maintain electrical isola-
tion between analog
input 1, digital input-
outputs, switched dc/
open collector outputs
and process outputs to
prevent ground loops.
This equipment is suit-
able for use in CLASS
I, DIVISION 2, Groups
A, B, C and D or Non-
Hazardous locations only.
Temperature Code T4A
Wiring Warnings
ç
Use National Electric
(NEC) or other country-
specic standard wiring
and safety practices
when wiring this control-
ler to a power source,
electrical sensors or pe-
ripheral devices. Failure
to do so may result in
damage to equipment
and property, and/or in-
jury or loss of life.
Explosion Hazard - Dry
contact closure Digital
Inputs shall not be used
in Class I Division 2 Haz-
ardous Locations unless
switch used is approved
for this application.
Explosion Hazard – Sub-
stitution of component
may impair suitability for
CLASS I, DIVISION 2.
Explosion Hazard - Do
not disconnect while the
circuit is live or unless
the area is known to be
free of ignitable concen-
trations of ammable
substances.
Wiring Your New PM PLUS™
Inputs and Outputs
Input
1
Input
2
Input Function Configuration Code
Slot A Slot B UNIVERSAL, RTD, THERMISTOR INPUTS
T1
S1
R1
T2
S2
R2
S2 (RTD) or current +
S3 (RTD), thermocouple -, cur-
rent -, potentiometer wiper,
thermistor or volts -
S1 (RTD), thermocouple +, volts
+, potentiometer or thermistor
Input 1: all configurations
Input 2: PM _ _ _ _ _ - _ [R,L] _ _ _ _ _
Slot A Slot B CURRENT TRANSFORMER INPUT 2
T2
S2 mA ac mA ac Input 2: PM _ _ _ _ _ - _ [T] _ _ _ _ _
Slot A Slot B SWITCHED DC / OPEN COLLECTOR OUTPUTS
X1 X3 common Output 1: PM _ _ _[C] _ - _ _ _ _ _ _ _
Output 3: PM _ _ _ _ _ - _ _ [C] _ _ _ _
W1 W3 DC-
Y1 Y3 DC+
Slot A Slot B SWITCHED DC OUTPUTS
W2 W4 mA ac Output 2: PM _ _ _ _ [C] - _ _ _ _ _ _ _
Output 4: PM _ _ _ _ _ - _ _ _ [C] _ _ _
Y2 Y4 mA ac
Slot A Slot B UNIVERSAL PROCESS OUTPUTS
F1 F3 voltage or current - Output 1: PM _ _ _ [F] _ - _ _ _ _ _ _ _
Output 3: PM _ _ _ _ _ - _ _ [F] _ _ _ _
G1 G3 voltage +
H1 H3 current +
Slot A Slot B MECHANICAL RELAY 5A, FORM C OUTPUTS
L1 L3 normally open Output 1: PM _ _ _ [E] _ - _ _ _ _ _ _ _
Output 3: PM _ _ _ _ _ - _ _ [E] _ _ _ _
K1 K3 common
K1 J3 normally closed
Slot A Slot B NO-ARC 15A FORM A
L2 L4 normally open Output 2: PM _ _ _ _ [H] - _ _ _ [H*] _ _
_
K2 K4 common
Communications
Slot B Modbus®RTU 232/485 Communications
CB
CA
CC
CB
CA
C5
C3
C2
Modbus®RTU EIA-485 T+/R+
Modbus®RTU EIA-485 T-/R-
Modbus®RTU EIA-485 common
Modbus®RTU EIA-485 T+/R+
Modbus®RTU EIA-485 T-/R-
Modbus®RTU EIA-232 common
Modbus®RTU EIA-232 to DB9 pin 2
Modbus®RTU EIA-232 to DB9 pin 3
Slot B: PM6 _ _ _ _ - [2] A A A _ _ _
DeviceNet™ Communications

Watlow PM PLUS™ 6 • 19 • Chapter 2: Installation
Wiring Notes
Maximum wire size
termination and torque
rating:
0.0507 to 3.30 mm2 (30
to 12 AWG) single-wire
termination or two 1.31
mm2 (16 AWG)
0.56 Nm (5.0 in-lb.)
torque
Adjacent terminals may
be labeled differently
depending on the model
number.
Do not connect wires to
unused terminals.
Maintain electrical isola-
tion between analog
input 1, digital input-
outputs, switched dc/
open collector outputs
and process outputs to
prevent ground loops.
This equipment is suit-
able for use in CLASS I,
DIVISION 2, Groups A,
B, C and D or Non-Haz-
ardous locations only.
Temperature Code T4A
Wiring Warnings
ç
Use National Electric
(NEC) or other country-
specic standard wiring
and safety practices
when wiring this control-
ler to a power source,
electrical sensors or pe-
ripheral devices. Failure
to do so may result in
damage to equipment
and property, and/or in-
jury or loss of life.
Explosion Hazard - Dry
contact closure Digital
Inputs shall not be used
in Class I Division 2 Haz-
ardous Locations unless
switch used is approved
for this application.
Explosion Hazard – Sub-
stitution of component
may impair suitability for
CLASS I, DIVISION 2.
Explosion Hazard - Do
not disconnect while the
circuit is live or unless
the area is known to be
free of ignitable concen-
trations of ammable
substances.
V+
CH
SH
CL
V-
DeviceNet power
Positive side of DeviceNet bus
Shield interconnect
Negative side of DeviceNet bus
DeviceNet power return
Slot B: PM6 _ _ _ _ - [5] A A A _ _ _
EtherNet/IP™ and Modbus®TCP
E8
E7
E6
E5
E4
E3
E2
E1
unused
unused
EtherNet/IP and Modbus®TCP receive -
unused
unused
EtherNet/IP and Modbus®TCP receive +
EtherNet/IP and Modbus®TCP transmit -
EtherNet/IP and Modbus®TCP transmit +
Slot B: PM6 _ _ _ _ - [3] A A A _ _ _
Profibus DP Communications
VP
B
A
DG
trB
B
A
trA
Voltage Potential
EIA-485 T+/R+
EIA-485 T-/R-
Digital ground (common)
Termination resistor B
EIA-485 T+/R+
EIA-485 T-/R-
Termination resistor A
Slot B: PM6 _ _ _ _ - [6] AAA _ _ _
J1939 CAN bus Communications
CL
CH
SH
V+
V-
Negative side of CAN bus
Positive side of CAN bus
Shield interconnect
CAN bus power
CAN bus power return
Slot B: PM6 _ _ _ _ - [7] A A A _ _ _
Slot C Power or Communications Wiring
Slot C Terminal Function Configuration
98
99 Power input: ac or dc+ Power input: ac or dc- all
CC
CA
CB
Standard Bus or Modbus®RTU EIA-485
common
Standard Bus or Modbus®RTU EIA-485
T-/R-
Standard Bus or Modbus®RTU EIA-485
T+/R+
PM _ _ _ _ _ - [1] _ _ _ _ _ _
CF
CD
CE
Standard Bus EIA-485 common
Standard Bus EIA-485 T-/R-
Standard Bus EIA-485 T+/R+
PM _ _ _ _ _ - [A,D,2,3,5] _ _ _ _ _ _
B5
D6
D5
Digital input-output common
Digital input or output 6
Digital input or output 5
PM _ _ [2] _ _ - _ _ _ _ _ _ _
PM _ _ [4] _ _ - _ _ _ _ _ _ _

Watlow PM PLUS™ 6 • 20 • Chapter 2: Installation
Wiring Notes
Maximum wire size termi-
nation and torque rating:
0.0507 to 3.30 mm2 (30
to 12 AWG) single-wire
termination or two 1.31
mm2 (16 AWG)
0.56 Nm (5.0 in-lb.)
torque
Adjacent terminals may
be labeled differently
depending on the model
number.
Do not connect wires to
unused terminals.
Maintain electrical isola-
tion between analog
input 1, digital input-
outputs, switched dc/
open collector outputs
and process outputs to
prevent ground loops.
This equipment is suit-
able for use in CLASS
I, DIVISION 2, Groups
A, B, C and D or Non-
Hazardous locations only.
Temperature Code T4A
Wiring Warnings
ç
Use National Electric
(NEC) or other country-
specic standard wiring
and safety practices
when wiring this control-
ler to a power source,
electrical sensors or pe-
ripheral devices. Failure
to do so may result in
damage to equipment
and property, and/or in-
jury or loss of life.
Explosion Hazard - Dry
contact closure Digital
Inputs shall not be used
in Class I Division 2 Haz-
ardous Locations unless
switch used is approved
for this application.
Explosion Hazard – Sub-
stitution of component
may impair suitability for
CLASS I, DIVISION 2.
Explosion Hazard - Do
not disconnect while the
circuit is live or unless
the area is known to be
free of ignitable concen-
trations of ammable
substances.
Low Power
PM_ _ [3,4] _ _ - _ _ _ _ _ _ _
Power
power
power
98
99
CF
CD
CE
B5
D6
D5
Slot C
fuse
• Minimum/Maximum Ratings
• 12 to 40VDC
• 20 to 28VAC) Semi Sig F47
• 47 to 63 Hz
• 10VA maximum power consumption
High Power
PM_ _ [1,2] _ _ - _ _ _ _ _ _ _
Power
power
power
98
99
CF
CD
CE
B5
D6
D5
Slot C
fuse
• Minimum/Maximum Ratings
• 85 to 264VAC
• 100 to 240VAC Semi Sig F47
• 47 to 63 Hz
• 10VA maximum power consumption
Isolation Block Diagram
Digital Inputs & Outputs
5-12
Switched DC, Open Collector,
Process outputs
Analog Input 1
Analog Input 2
Communications Ports
Controller
Low Voltage Power Bus
Mechanical Relay,
Solid-State Relay,
NO-ARC Relay
Outputs
Low-voltage Isolation: 42V peak
Safety Isolation: 2300VAC
Safety Isolation
No Isolation
Low Voltage
Isolation
No Isolation
Low-voltage
Isolation
Low-voltage
Isolation
Controller Power Supply
12 to 40VDC
20 to 28VAC
100 to 240VAC
Safety Isolation
Safety Isolation