Acromag BusWorks 900PB Series User manual

BusWorks® 900PB Series
ProfiBus/RS485 Network I/O Modules
Model 961PB-2006 Six Differential Current Inputs
Model 962PB-2006 Six Differential Voltage Inputs
USER’S MANUAL
ACROMAG INCORPORATED Tel: [phone]
30765 South Wixom Road Fax: [phone]
Wixom, MI 48393-2417 U.S.A.
Copyright 2002, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice. 8500692D

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
2
IMPORTANT SAFETY CONSIDERATIONS
You must consider the possible negative effects of power, wiring,
component, sensor, or software failure in the design of any type of
control or monitoring system. This is very important where property
loss or human life is involved. It is important that you perform
satisfactory overall system design and it is agreed between you and
Acromag, that this is your responsibility.
GETTING STARTED
MOUNTING AND DIMENSIONS………………………
3
CONTROLS & INDICATORS..…………………………
3
ISOLATION BARRIERS..……………………………….
3
SETTING SLAVE ADDRESS…………………………..
4
CONNECTIONS………………………………………….
4
DIN-Rail Mounting And Removal………………
4
Network……………………………………………..
5
Power………………………………………………..
6
Analog Inputs……..……………………………….
6
Earth Ground..………………………………….….
8
TROUBLESHOOTING…………………………………..
8
Tips For Building ProfiBus Networks..……….
9
Top Four Common ProfiBus Problems……….
9
Troubleshooting Tools…………………………..
9
Using Connectors To Troubleshoot…………..
10
Diagnostics Function…………………………….
10
Diagnostics Table……………………………….
10
CALIBRATION…………………………………………...
11
TECHNICAL REFERENCE
KEY FEATURES…………………………………………
13
HOW IT WORKS………….……………………………..
14
SPECIFICATIONS……………………………………….
15
Model Numbers…………………………………..
15
Analog Inputs..………………....…………………
15
General Specifications…………………………..
16
Agency Approvals…..…………………………….
16
Enclosure/Physical……………………………….
16
Environmental……………………………………..
17
Communication Interface………………………..
18
Controls & Indicators…………………………….
19
Data Types…………………………………………
19
Module Specific Parameters……………………
20
Windows® is a registered trademark of Microsoft Corporation.
Profibus® is a registered trademark of ProfiBus Trade Organization.
All trademarks are the property of their respective owners.
TABLE OF
CONTENTS
Symbols on equipment:
Means Refer to User’s Manual
(this manual) for additional
information”.
The information of this manual
may change without notice.
Acromag makes no warranty
of any kind with regard to this
material, including, but not
limited to, the implied
warranties of merchantability
and fitness for a particular
purpose. Further, Acromag
assumes no responsibility for
any errors that may appear in
this manual and makes no
commitment to update, or
keep current, the information
contained in this manual. No
part of this manual may be
copied or reproduced in any
form without the prior written
consent of Acromag, Inc.
!

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
3
IN5-
46
IN4-
44 43 41 33
DC-
32
TB1
11
IN0+
13
IN0-
14
IN4+
IN1-
16
TB4
TB4
21 22
IN2-
24
GND
IN3+
25
TB3
INPUTS 4, 5
45 LSD42
PWR
DC+
31
L
C
RUN BUS
3.75 (95.3)
TB1
12
IN5+
TB2
TB2TB2
IN1+
15
IN3-
IN2+
2623
INPUTS 2, 3
TB3
4.68 (118.9)
3.90
(99.1)
MSD
2.34 (59.4)
INPUTS 0, 1
PROFIBUS
Acromag
SLAVE
ADDRESS
(HEX)
1.05
(26.7) "T" RAIL DIN MOUNTING
DIN EN 50022, 35mm 4.35
(110.5)
NOTE: Dimensions Are INCHES (MILLIMETERS).
MODEL961/962PBENCLOSUREDIMENSIONS
TB1
IN4-
44 41
GND
33
PWR
IN0+
13
IN1-
16 21
IN2-
24
TB3
BUS
IN5-
IN5+
46 45
TB2TB2
IN4+
43 42
DC+
DC-
32 31MSD
TB1
11 12
TB2
IN0-
14
IN1+
15
TB4
TB4
22
IN3+
25
IN3-
IN2+
2623
INPUTS 2,3
INPUTS 4,5
RUN
BUS STATUS LED (YELLOW)
LSD
(PLUG-IN TYPE)
TERMINAL BLOCKS
PROFIBUS CONNECTOR
DB9 FEMALE
PROFIBUS
Acromag RUN/PWR LED (GREEN)
SLAVE
ADDRESS
(HEX)
TB3
DP SLAVE ADDRESS
SWITCHES
REMOVABLE
INPUTS 0,1
IN4-
44 41 33
PWR
NETWORK
13
IN0+
16
IN1-
21
5V
24
IN2-
TB3
TB1
GND
INPUTS 4, 5
IN5-
46 4345 LSD42
INPUTS2,3
DC+
DC-
32 31
TB1
11 1412
IN0-
INPUTS4,5
TB2
2215
IN1+
TB4
TB4
25 2623
IN3+
IN3-
IN2+
INPUTS 2, 3
PWR
IN4+ IN5+
TB2TB2
INPUTS0,1
MSD
INPUTS 0, 1
OPTICAL
5V
TRANSFORMER
TB3
961/962PB-2006
ISOLATION
DIAGRAM
SLAVE
ADDRESS
(HEX)
MOUNTING AND
DIMENSIONS
Unit mounts to “T” type DIN
rails (35mm, type EN50022).
Units may be mounted side-
by-side on 1-inch centers.
WARNING: IEC Safety
Standards may require that
this device be mounted within
an approved metal enclosure
or sub-system, particularly for
applications with exposure to
voltages greater than or equal
to 75VDC or 50VAC.
CONTROLS &
INDICATORS
Green Run LED will stay ON if
power is on and unit is OK,
and will blink if unit fails.
Yellow BUS LED will turn ON if
module is properly connected
to the network and in data
exchange mode.
ISOLATION BARRIERS
Dashed Lines denote isolation
barriers.
The input circuit, network, and
power circuit are isolated from
each other for safety and noise
immunity.

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
4
x1 0
0
1
16
2
32
6
96
96 75
4
8
F2 1
0
7
112
965 7
4
8
F2 1
0
x1
8 C D
208
E
2
0
01 12 26 6
3
7
7
3
8
8C 12 D 13 E 14
1
HEX 3 54
6448 80
A
B
CA
B
C
E E
x16
9 BA
128 160144 176
F
224240
HEX
DEC 3 54 3 54
D D
MSD
9 BA
910 11 F 15
192MSD
x16
LSD
2. Determine the DECimal remainder and set the LSD switch to its
corresponding HEX digit.
LSD
HEX ADDRESS
SET SWITCHES TO A VALID SLAVE ADDRESS FROM0 TO 125 (00H TO 7DH)
1. Choose a slave address from 0-125 and locate highest MSD number less
than this address. Set MSD switch to this number's corresponding HEX digit.
TOP EDGE VIEW
46 45 43 42
DC-
32
DC+
31
11 12 14 15
TB4
TB2
22 23 25 26
44 41 33LSD MSD
PWR
TB1
13 16 21 24
SLAVE
ADDRESS
(HEX)
TB3
"T"TYPE
DINRAIL
PUSH
AnySeries 9XXPBProfiBusModule
RemoveTerminalBlocksOnThis
SideToProvideClearance
MODULEREMOVAL
FROMDINRAIL
PUSH SCREWDRIVER ASSHOWN
TOTILTANDLIFTMODULEOFFRAIL
USEYOURFINGER TOAPPLY
DOWNWARDPRESSUREHERE
ASYOU LIFTANDTILTMODULE
TOREMOVEITFROMRAIL
PRYWITHSCREWDRIVER
INSERTEDIN SLOTHERE
(DONOTTWISTTOAVOID
DAMAGINGPLASTIC TAB)
The address stored in the internal EEPROM is modified via the Set Slave
Address command. If the address switches are set to 126 (or 126 to 254)
upon power-up, the module will retrieve the last address stored within its
EEPROM (126 from the factory). With both the internal EEPROM and
external switch addresses set to 126, the unit will await the Set Slave
Address command after power-up, before proceeding to the
parameterization state (address 126 cannot be used in data exchange mode
and is reserved for commissioning purpose only). You must use the Set
Slave Address command to change the internal (EEPROM) address
following power-up in order to proceed. However, if the switches are set to
an address less than 126 upon power-up, then the switches determine the
slave address and the EEPROM setting is ignored. You can later restore the
internal EEPROM setting to 126 by powering the unit up with the address
switches set to 255 (FF). You would then power the unit up again with these
switches set to 126 in order to return the unit to its commissioning state.
When attaching the module to the T-type DIN
rail, angle the top of the unit towards the rail
and locate the top groove of the adapter over
the upper lip of the rail. Firmly push the unit
towards the rail until it snaps into place. To
remove, first separate the input terminal
block(s) from the bottom side of the module to
create a clearance to the DIN mounting area.
Next, while holding the module in place from
above, insert a screwdriver into the lower arm
of the DIN rail connector and use it as a lever
to force the connector down until the unit
disengages from the rail (do not twist the
screwdriver to avoid damaging plastic).
SETTING SLAVE
ADDRESS
Address is set to 126 (7EH)
from the factory. This address
is reserved for commissioning
purposes only.
Locate hexadecimal address
switches in recessed opening
next to the power terminals.
Use a screwdriver to rotate
these switches to set a unique
valid address from 0 to 125.
If the switches are set to a
valid address from 0-125, then
the switch setting determines
the slave address and the Set
Slave Address software
command will be rejected.
If these switches are instead
set to 126 (7EH) upon power-
up, the unit will retrieve its
address from the internal
EEPROM, which is modified
via the Set Slave Address
command.
If these switches are set to
255 (FFH) upon power-up, this
will return the address stored
in EEPROM to 126 (7EH).
CONNECTIONS
DIN-Rail
Mounting
& Removal

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
5
124 5
6 7 8 9
IN
R
3
Insul Shld
BA
off on 0.35
0.25
ProfiBus
Cable
(Violet)
Termination
Switch on
OUT
off
DB9
(Male)
Grn
0.30
Network
Green Wire =A
Red Wire =B
Siemens ProfiBus Connector
PVC
Sheath
Red
StripCable
Similar to Shown
Use ProfiBus cable
perDIN19245and
EN 50170.
DonotmixRS485 A& Bconnections. Green wire is A, red wire is B.
You MUSTterminate the networkat both ends only.
Termination resistors are integrated in the ProfiBus connector.
When you switch terminationON,the out-going connections
are disconnected from the network.
Network Length
Use Type A ProfiBus cable per EN 50170. Keep line lengths less than the
length indicated below for your transmission rate. For baud rates not shown,
the lower length of the closest range end points apply (i.e. 100M at 3Mbps).
Bus Segment Length Limit Per Baud Rate For Type A Bus Cable
BAUD
9.6K
19.2K
93.75K
187.5K
500K
1.5M
12M
Type A
1200M
1200M
1200M
1000M
400M
200M
100M
Termination
The network must be terminated at both ends only. Most ProfiBus
connectors include a switch for termination as shown above. Note that this
switch will also disconnect the outgoing network signal.
CONNECTIONS
Network
Use ProfiBus connectors
similar to the one shown at
right (Siemens version shown).
Always use ProfiBus cable per
DIN 19245 and EN 50170.
When building cables, do not
mix A & B connections. Green
wire is A, Red wire is B.
The connector must have built-
in inductors in order to operate
at the higher baud rates.
GSD Files:
961PB-2006: ACRO0704.GSD
Ident_Number=0704H
962PB-2006: ACRO0703.GSD
Ident_Number=0703H
IMPORTANT: Do not connect
earth ground to logic Ground
(DB9 Pin 5). Earth Ground
should connect to cable Shield
(common to DB9 Pin 1).
Note that Acromag modules
also support the optional RTS
direction control signal at Pin
4.

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
6
--
INPUTS 0, 1 INPUTS 0, 1
1616
IN1-IN1-
1515
IN1+IN1+
1313
IN0+IN0+
1212 1616 1414
IN0-
1313 1111
+
+V
I
SHIELDED
CABLE
SHIELDED
CABLE
1414
IN0-
1111 1515
IN1+IN1+
IN1-IN1-
1212
IN0+IN0+
NOTE 1
TB1
DC
TB1
DC
VOLTAGE
CURRENT
(962PB)
(961PB)
Ranges: 0-20mA, 4-20mA,
0-11.17mA, 0-1mADC.
NOTE 1: THISGROUNDCONNECTIONISRECOMMENDEDFORBEST
RESULTS. IFSENSORSAREINHERENTLYCONNECTEDTOGROUND,
USECAUTIONANDAVOIDMAKINGADDITIONALGROUNDCONNECTIONS
WHICHCOULDGENERATEGROUNDLOOPSANDMEASUREMENT ERROR.
Ranges: +10V, +5V,
+2.5V, +1.25V,
+625mV, +313mV,
+156mV, +78mV.
on
off
RUN RUN BUS
RUN BUS
on
BUS
on
off
BUS
on
RUN
on
off
RUN
off off
500Kbps
19.2Kbps
400M
1200M
NODE 32'
PROFIBUS
BUS
A cr om a g
on
off
PROFIBUS
A cr om a g
on
A cr om a g RUN A cr om a g
PROFIBUS
RUN
A cr om a g
BUS
A cr om a g
PROFIBUS
BUS
A cr om a g
12Mbps
9600bps
93.75Kbps
187.5Kbps
100M
1200M
1000M
1200M
RS485 SIGNAL
REPEATER
off
1
PROFIBUS PROFIBUS PRO FIBUS
1.5Mbps
BAUD
200M
LENGTH
61 NODE 2' NODE 5NODE 31
NETWORK LENGTH PER
BAUD RATE w/ TYPE A
PROFIBUS CABLE
END OF NETWORK
(TERMINATION ON)
TERMINATION
SWITCH
NODE 2
NODE 1
START OF NETWORK
(TERMINATION REQD)
PROFIBUS MASTER
PLUG-IN CARD
INSTALLED IN PC.
START OF SEGMENT
(TERMINATION ON)
NODE 32
NODE 1'
2NODE 4NODE 3 3
31
SEGMENT 2 (UP TO 1200 METERS,
UP TO 32 NODES PER SEGMENT)
430
NOTE: THE PROFIBUS CONNECTORS SHOWN HAVE A TERMINATION NETWORK BUILT-IN.
WITH TERMINATION ON, THE OUTGOING CABLE IS DISCONNECTED FROM NETWORK. SWITCH
TERMINATION ON ONLY AT THE BEGINNING AND END OF A NETWORK OR NETWORK SEGMENT.
SEGMENT 1 (UP TO 1200 METERS, UP TO 32 NODES PER SEGMENT)
END OF SEGMENT
(TERMINATION ON)
PROFIBUS MASTER - A
HOST PC WITH PROFIBUS
CARD INSTALLED AND
RUNNING APPLICATION
SOFTWARE.
PROFIBUS RS485 NETWORK
A network segment may contain up to 32 nodes without the use of a signal repeater.
Transmission distance is up to 1200 meters per segment without a repeater.
Termination must be placed at both ends of a network or network-segment.
The total number of nodes and total distance may be extended by using signal repeater(s).
The maximum number of modules possible is further limited by the address range from 0 to 125.
+
33
GND
DC-
32
TB3
TB3
LSD MSD
SLAVE ADDRESS (HEX)
DC+
31
PWR
12TO36VDC
OBSERVEPROPERPOLARITY
EARTH
GROUND
INPUTPOWER
ISISOLATED
Connect 12-36V DC to the power terminals labeled DC+ & DC-.
Observe proper polarity. For supply connections, use No. 14 AWG
wires rated for at least 75C. CAUTION: Do not exceed 36VDC peak.
IMPORTANT –External Fuse: If unit is powered from a supply capable of
delivering more than 1A to the unit, it is recommended that this current be
limited via a high surge tolerant fuse rated for a maximum current of 1A or
less (for example, see Bel Fuse MJS1).
Connect analog input signals to the input terminals as shown below
according to your signal type.
Network
Example ProfiBus System
Connections
Up to 125 slave modules may
network together with a class 1
master using four repeaters
(one repeater every 31 nodes).
Address 0 is typically reserved
for the class 1 master.
Note: 12Mbps installations
require a minimum cable
length of 1M between stations.
TIP: A recommended RS485
repeater for ProfiBus is the
Siemens 6ES79720AA01-
0XA0.
Power
Voltage
Current
12VDC
195mA
15VDC
146mA
24VDC
91mA
36VDC
67mA
CAUTION: Risk of Electric
Shock –More than one
disconnect switch may be
required to de-energize the
equipment before servicing.
Analog Inputs
Input is DC current (961PB),
or DC voltage (962PB),
according to model number.
Inputs are not isolated
channel-to-channel, except for
small common mode voltages
up to ±4V peak.

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
7
-
+
+
IN0-
NC
NOTE1
TB1
TB1
IN1-
IN1+
NC
IN0+
-
ACCURRENT
IN1-
IN0-
IN0+
XMTR
NC
5020-350
SENSOR
DC
PWR IN1+
2-WIRETRANSMITTER(961PB)
NC
2-WIRE
BLACK WIRE (-)
ACCURRENT
SENSORINPUT(961PB)
RED WIRE (+)
1616 1515 1313 1212
IN1-IN1-
-
1414 1111
IN0-
INPUTS 0, 1
IN0+IN0+
TB1
+
962PB
IN1+IN1+
5V
DIFFERENTIALVOLTAGEMONITORING
BRIDGE OUTPUTS
NOTE: 962PB INPUTS ARE NOT ISOLATED CHANNEL-TO-
CHANNEL, EXCEPT FOR COMMON MODE VOLTAGES
LESS THAN +/-5V. AS SUCH, LIMIT BRIDGE EXCITATION
TO5V OR LESS.
-
-
+
1616 1313
+
IN1-IN1-
-
IN0+IN0+
+
-
INPUTS 0, 1
+24V DC
+OUT
FIELD
XMTR
14141515 1212 1111
S
E
N
S
O
R
S
IN0-
IN1+IN1+
TB1
DIFFERENTIAL
CURRENTMONITORING
INP
Temperature
Pressure
Level
Flow
Speed
961PB
DCS/PLC
NOTE: 961PB INPUTS ARE NOT
ISOLATED CHANNEL-TO-CHANNEL,
EXCEPT FOR COMMON MODE
VOLTAGES LESS THAN +/-5V. AS
SUCH, A 4-20mA ISOLATOR MAY BE
REQUIRED FOR CURRENT LOOPS
WITH LOADS GREATER THAN 250 OHMS.
-
-
+
+
INPUTS 0, 1
-
1616
IN1-IN1-
1515 1313
IN0+IN0+
1212
+24V DC
+OUT
++
TB1
962PB
1414
IN0-
IN1+IN1+
1111
FIELD
XMTR
--
S
E
N
S
O
R
S250 OHMS
INP DCS/PLC
Temperature
Pressure
Level
Flow
Speed
NOTE: 962PB INPUTS ARE NOT
ISOLATED CHANNEL-TO-CHANNEL,
EXCEPT FOR COMMON MODE
VOLTAGES LESS THAN +/-5V. AS
SUCH, A V/V ISOLATOR MAY BE
REQUIRED FOR USE WITH LOOP
LOADS GREATER THAN 250 OHMS.
DIFFERENTIAL
VOLTAGEMONITORING
250
OHMS
CHART RECORDER
DATA LOGGER
OR TRANSMITTER
CONNECTIONS
Analog Inputs
Connections to an optional AC
current sensor or two-wire
transmitter (961PB Only).
Although the 961/962PB is not
isolated channel-to-channel, it
does provide common mode
isolation for low voltages in
range of ±5V. This makes it
useful for differential current
and voltage monitoring
applications similar to the
examples shown here.

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
8
on
R
off
Insul
A
on
OUT
R
off
CABLE
SHIELD CABLE
SHIELD
INP GROUND
CLAMP
B
Grn
PROFIBUS
CONNECTOR GROUNDING:
ACROMAG MODULES:
THE SHIELDIS COMMONTO
THE HOUSING (FORMETAL
ENCLOSURES).
EARTH GROUNDSCREW
ONEQUIPMENT (WHEN
AVAILABLE)
PROFIBUS FIELDDEVICE
EQUIPOTENTIAL BONDING STRIP
(IF NECESSARY--SEE NOTE)
Green Wire= A
Red Wire= B
UseProfiBus cable
per DIN19245 and
EN50170.
PVC
Sheath
Red
GROUND
CLAMP
Useonly approved cables
withbraided shields of
density greater than 80%.
PROFIBUS
CONNECTOR
Shld
PROFIBUS CABLE
THE SHIELDIS COMMONTO
THE HOUSING (FORMETAL
ENCLOSURES).
PROFIBUS FIELDDEVICE
PROFIBUSWIRINGANDGROUND
NOTE: If a potential difference exists between
earth grounding points, an equalization current
can flow through the cable shield when connected
at bothends. Inthis case, it may be necessary to
install an additional potential equalization line between
fieldlocations tominimize this current as shown here.
The metal shroud of the DB9ProfiBus connector on
Acromagmodules is commonto pin1 of theDB9
connector (SHIELD). This is also common to the
cableshieldwhichmust be earth grounded. Acromag
modules are enclosed inplastic and do not
provide a dedicated earth ground screw. As such,
a local earth ground connection to the cable shield
must be madeas shown above.
EARTH GROUNDSCREW
ONEQUIPMENT (WHEN
AVAILABLE)
1. Always connect the cable shield toearthground at both
ends as shown.
2. If the field device does not include an earth ground
screw, it may benecessary to strip the cableinsulation
near the field device and clamp the cable shield to a local
grounding bar or surfaceas shown.
Connect Earth Ground as shown in the connection drawings above.
Additionally, ground the ProfiBus cable as shown in the drawing below.
The ground connections noted are recommended for best results. If
sensors are already grounded, use caution and avoid making additional
ground connections which could create ground loops.
The plastic module housing does not require earth ground.
The module routinely performs internal diagnostics following power-up
or reset. During this period, the green “Run” LED will flash for a moment. If
the diagnostics complete OK, the “Run” LED will stop flashing after a few
seconds and remain ON. This indicates the unit is operating normally.
Once the unit has passed through the initialization, parameterization, and
configuration states, and is in data exchange mode, the yellow BUS LED will
be ON. If the BUS LED is OFF and the unit is connected to the network,
then this may be indicative of an initialization problem (check the address
setting).
Follow the ProfiBus installation guidelines.
Use the recommended cable and connectors of the standard.
Verify that none of the wires are broken or shorted.
Don’t mix the A & B lines. Use green wire for A and red wire for B.
Do not exceed the recommended segment length for the baud rate.
Make sure that there are no more than 32 RS-485 devices per
segment (including the master device and the repeater).
Check for proper termination of all copper-wire network segments
(an RS-485 segment must have a termination resistor at both ends
of the segment only).
Earth Ground
Warning: To comply with
safety and performance
standards, use shielded cable
and connect earth ground as
noted. Failure to use good
wiring and grounding practices
may be unsafe and hurt
performance.
TROUBLE-
SHOOTING
Tips For Building
ProfiBus Networks

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
9
All activated terminations must be powered all the time. If this is not
possible, then consider using an active-termination box.
Check whether the station address is set to the correct value.
If your network connects between buildings or runs through
hazardous environments, consider the use of fiber-optics.
Avoid drop lines and keep their length within the specified maximum.
For T-drops, consider using repeaters and active-bus terminations.
1. Incorrect slave address set at the slave.
2. ProfiBus connector between the master and slave has its
termination switch turned ON.
3. Incorrect module configuration sent to slave.
4. Configuration is based on outdated GSD file information.
There are several models of handheld devices on the market that
simplify the installation and troubleshooting of ProfiBus networks. The more
sophisticated units include LCD displays that read out errors directly. Two of
these of these devices are referenced below:
Hand-Held ProfiBus Network Maintenance Tools
Manufacturer
Part Number
Special Features
Siemens
BT 200
Primarily a Cable Tester
Comsoft
NetTest II Set
4000-7-06C-J
Includes DP Mono-Master
Functionality
In general, these devices can be used to check the network wiring
before devices are connected to the bus and are often used to indicate:
Whether the A and B lines have been switched.
Whether a short exists between the A & B lines and shield.
The occurrence of a wire-break in the A or B line, or shield line.
Improper termination.
These devices can also be used to check the RS-485 interface of
ProfiBus devices after they have been connected. They may include the
following functions:
The ability to create a list of all stations connected to a network
(useful for identifying missing or “offline” devices).
Test individual stations and help identify duplicate addresses.
Measure the distance along a network segment to verify whether it
complies with the Profibus requirements for distance and data rate.
Detect signal reflections along the network, useful for locating bus
line interruptions and discontinuities.
Acromag strongly suggests the use of these tools for building and
maintaining ProfiBus networks.
Note that Profichip also offers a Profibus connector (PA003100) that
includes 4 network diagnostic LED’s that may be helpful in trouble-shooting
your network (see table below).
Tips For Building
ProfiBus Networks
Top Four Common
ProfiBus Problems
Troubleshooting Tools

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Standard 9-pin ProfiBus connectors with integrated termination
resistors are helpful for troubleshooting segments of the network. In most of
these connectors, the outgoing portion of the connector is disconnected
when the termination resistors are switched ON. As such, you can
selectively disable segments of the network until you find the branch that is
causing the problem. For example, if your handheld unit is connected to the
beginning of a network and indicates a wire break, you can selectively switch
off portions of the network and recheck your handheld unit to help pin point
the portion of the network that is causing the problem. Below are some
ProfiBus connectors that we recommend:
Preferred Bus Connectors
Mfg
Part Number
Special Features
Siemens
6ES7972-0BA12-0XA0
Switchable Termination
Siemens
6ES7972-0BB12-0XA0
Adds PB Interface (Piggy Back DB9
For Diagnostic Connection)
Profichip
PA003100
Adds PB Interface Plus 4 Diagnostic
LED’s For Trouble-Shooting.
ProfiBus includes a rich diagnostic function that can be used to
troubleshoot ProfiBus devices. This function contains 6 bytes of standard
diagnostic information, plus up to an additional 238 bytes of device specific
diagnostic information. Most configuration tools support this command and
can read the diagnostic information from the Profibus device.
SYMPTOM
POSSIBLE CAUSE
POSSIBLE FIX
Yellow BUS LED
does not light.
Initialization
Problem. LED ON if
module in data
exchange state.
Check station address. Is
GSD file correct? Check for
wiring error.
Both the internal
EEPROM and
external address
switches are set to
an address of 126.
Module is awaiting Set Slave
Address command in order
to complete initialization.
Alternately, set switches from
0-125 and re-power.
Cannot
communicate.
Power ON at module
and/or converter?
Check power. Is green RUN
LED ON?
Is address correct?
Check slave address setting.
Is the termination
switch of the
Profibus connector
at the prior node
turned on?
Switch Termination on only at
the ends of the network.
With termination on, the
outgoing connections are
disconnected from the
network chain.
Yellow BUS LED
turned OFF.
Communication
Halted.
Cycle power to reset unit.
Investigate grounding.
Continuous flashing
green RUN LED.
Internal firmware
problem.
Return module for service.
Many
Communication
Errors.
Missing Termination
Resistors?
Termination resistors must
be placed only at both ends
of a network or segment.
Is baud rate too high
for distance?
Maximum distance is limited
below 1200 meters as baud
rate is increased above
93.75Kbps (see Table).
Using Connectors To
Troubleshoot
Diagnostics Function
Diagnostics Table
If your problem still exists after
checking your wiring and
reviewing this information, or if
ther evidence points to another
problem with the unit, an
effective and convenient fault
diagnosis method is to
exchange the module with a
known good unit. Acromag’s
Application Engineers can
provide further technical
assistance if required.
Complete repair services are
also available from Acromag.

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There are six calibration channels for these models. The following table
gives the calibration values for the input ranges of these models. These are
the input signals required to calibrate the range endpoints. Your success in
recalibrating the input will depend upon the accuracy and precision of your
signal source. Note that on the 961PB-2006, the 4-20mA range is a sub-
range of the 0-20mA range and is automatically calibrated at the same time.
If calibration is required, it is recommended that all ranges of the unit be
done.
IMPORTANT: For best results, be sure to use a precision signal source
capable of reproducing the nominal endpoint signals shown below, at least
as accurate as the module itself (better than ±0.1% of span). Always allow
the module to warm up a few minutes prior to calibration.
RANGE
ZERO Calibration
FS Calibration
Model 961PB-2006
0-20mA DC, 4-20mA DC
1.0mA
20.0mA
0-11.17mA DC
1.0mA
11.17mA
0-1mA DC
0.25mA
1.00mA
Model 962PB-2006
±10V DC
-10000.0mV
10000.0mV
±5V DC
-5000.0mV
5000.0mV
±2.5V DC
-2500.0mV
2500.0mV
±1.25V DC
-1250.0mV
1250.0mV
±625mV DC
-625.0mV
625.0mV
±313mV DC
-312.50mV
312.50mV
±156mV DC
-156.25mV
156.25mV
±78mV DC
-78.13mV
78.13mV
These models have two I/O Configuration definitions in their GSD files,
one for normal operation, and another for accomplishing calibration. The
normal data exchange definition supports 6 input words (12 input bytes
representing your measured values). A second calibration definition
supports 6 input words and 6 output words. The master software will allow
you to choose which mode the slave will assume—Input Mode or
Configuration Mode. The method used to transfer information between the
master and slave will vary widely between systems. The steps below
represent the minimum steps necessary to accomplish software calibration.
If you choose to perform calibration and select Configuration Mode, the
master will download the 6I/6O word configuration during the startup
sequence, and the module may then be calibrated as follows:
1. With your master software, select the “Configuration Mode” from the
GSD file when setting up the master to communicate with the module.
2. With user parameterization bytes 0 & 1, set the ranges that are to be
calibrated.
3. Apply the zero calibration signal (see table of prior page) to the input to
be calibrated and allow the input to settle a few seconds.
4. Write FFH into the low-order byte of the channel’s output word several
times (to ensure transmission). In Configuration Mode, the module will
automatically calibrate the channel’s zero value when FFH is detected.
Then write 00H into the low-order byte to complete zero calibration.
CALIBRATION
IMPORTANT: This module
has already been calibrated at
the factory and recalibration is
not normally required, except
as necessary to correct for
long term component aging, or
to satisfy your company’s
maintenance requirements.
Do not attempt to recalibrate
this module unless absolutely
required, as miscalibration will
negatively affect the module’s
performance.

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12
5. Apply the full-scale calibration signal (Cal Hi, see table) to the input to be
calibrated and allow the input to settle a few seconds.
6. Write FFH into the high-order byte of the channel’s output word several
times to ensure transmission. In Configuration Mode, the module will
automatically calibrate the channel’s full-scale value when FFH is
detected. Then write 00H into the high-order byte to complete full-scale
calibration.
7. Repeat steps 3-6 for the other channels of the same range.
8. With user parameter bytes 0 & 1, select the next range to be calibrated.
Note (961PB): The 4-20mA range is calibrated when the 0-20mA range
is calibrated and is not calibrated separately. All other ranges are
calibrated separately.
9. Repeat steps 3-7 for all channels of this range.
10. Repeat steps 8-9 until all input ranges have been calibrated.
11. When finished calibrating, use the master software to return the module
to the normal “Input Mode” to prevent miscalibration.
After completing calibration, the module should be reconfigured as
required and placed in the normal “Input Mode” configuration (I/O
configuration is 6 input words only). In general, your software allows you to
select the normal “Input Mode” configuration, and the slave will then be
taken off-line by the master and reconfigured. If reconfiguration is
successful, the slave module will pass to the data exchange state with a
normal I/O configuration.
CALIBRATION

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TECHNICAL REFERENCE
PTO Certified - Unit certified by the ProfiBus Trade Organization.
Safety Agency Approvals & PTO Certification –CE, UL, & cUL listed,
plus Class 1; Division 2; Groups A, B, C, D approvals.
Fully Independent Slave w/ Direct I/O Connection –Self-contained
unit does not require special bus couplers, power supply, or rack mount
to operate.
Plug-In Terminal Blocks & DIN-Rail Mount - Make mounting, removal,
and replacement easy.
Industry Standard ASIC –Uses Siemens SPC3 intelligent ASIC to talk
ProfiBus.
Isolated RS485/ProfiBus Network Interface –Highly immune to noise
and can operate over long distances. Allows many modules to network
together.
Auto-Baud Rate Detection –The baud rate is set automatically.
High-Speed Data Rates –Half-duplex RS485 up to 12M baud.
Includes RTS Support –ProfiBus interface includes the optional RTS
(Request-To-Send) direction control.
Flexible Multi-Range Analog Inputs - Accepts either DC current or DC
voltage, according to model number.
Range Variability –The first 3 channels must share the same range,
but this can be different than the range of the last 3 channels.
Optional AC Current Input (961PB Only) - An optional AC current
sensor can be purchased separately to support AC current inputs.
Precise High-Resolution A/D Conversion –Modules use high-
resolution, low noise, sigma-delta analog-to-digital conversion for high
accuracy and reliability.
Nonvolatile Reprogrammable Memory –Allows the functionality of this
device to be reliably reprogrammed thousands of times.
Fully Isolated –Input channels (as a group), network, and power are all
isolated from each other for safety and increased noise immunity.
LED Indicators –A green LED indicates power. A yellow bus status
LED indicates proper network connection.
Watchdog Timer Built-In –Standard for the ASIC and operates in the
data exchange mode if communication with the master is lost.
Self-Diagnostics & Diagnostic Watchdog - For easy maintenance
and troubleshooting. Includes a hardware watchdog timer built into the
microcontroller that causes it to initiate a self reset if the controller ever
“locks up” or fails to return from an operation in a timely manner.
Wide-Range DC-Power –Diode-coupled for use with redundant
supplies, and/or battery back-up.
Hardened For Harsh Environments - For protection from RFI, EMI,
ESD, EFT, & surges. Has low radiated emissions per CE requirements.
Wide Ambient Operation –Reliable over a wide temperature range.
KEY FEATURES

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8
EF02
1
D
C3 4
8
0
EF
D
C
23
4
9
A
B 5
6
7B9
A5 6
4
-6V
5V
1
+6V
RTS
IN5+
IN3+
IN4-
IN3-
IN0-
IN1-
IN1+
IN2+
M
U
X
MUX
+6V
5V
7
4
SHLD
DB9
IN4+
IN5-
IN2-
IN0+
-6V
M
U
X
+
AIN2
-
+5V
+
AIN1
-
PWR
LED +5V BUS
LED +5V
12-36VDC P
O
W
E
R
N
E
T
W
O
R
K
BIAS
-6V
+6V
-6V
+6V
NEGVOLTAGE
CONVERTER
INPUT/LOGIC
POWER
NETWORK
POWER
MICRO
CONTROLLER
ISOLATED
FLYBACK
SWITCHER
RS485
PROFIBUS
TRANSCEIVER
DC+
DC-
+1.6V
ISOLATED INPUT POWER
ISOLATED RS485
ISOLATED SECONDARIES
ADDRESS
BUFFER
A/D
CONVERTER
PROFIBUS
SPC3 SLAVE
ASIC
INPUTS0, 1, &2MUST
BESAMERANGE
INPUTS3, 4, &5MUST
BESAMERANGE
961/962PB SIMPLIFIED SCHEMATIC
These input modules provide up to 6 process current (961PB), or 6
differential DC voltage (962PB) input channels, and an isolated RS485
ProfiBus interface for configuring and monitoring the input channels. The
current input model uses precision 24.9Ω current sink resistors across the
inputs. Voltage input models use 10:1 precision resistor voltage dividers at
the input. A multiplexer is used to connect each input voltage to an A/D
converter (separate A/D channels serve 3 input channels each). The A/D
converter then applies appropriate gain to these signals, performs analog-to-
digital conversion, and digitally filters the signals. The digitized A/D signal is
then transmitted serially to a microcontroller. The microcontroller completes
the transfer function according to the input range per its embedded program.
Configuration and calibration parameters are stored in non-volatile memory
integrated within the microcontroller. These modules implement the
ProfiBus protocol via an industry-standard SPC3 ASIC from Siemens. This
ASIC acts like a RAM or UART chip to the internal microcontroller and
completely handles the requirements of the protocol standard. The ASIC will
transfer network data to the microcontroller and automatically provide the
response to the bus. The ASIC handles the ProfiBus protocol and
communicates with the network via an optically isolated RS485 transceiver.
A wide input switching regulator (isolated flyback) provides isolated power to
the input circuit and the RS485 port. Refer to the simplified schematic below
to gain a better understanding of the circuit.
HOW IT WORKS

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These DIN-rail mount, ProfiBus DP slave, input modules will condition up to
six differential DC current (961PB) or DC voltage (962PB) input signals, and
provide an isolated RS485/ ProfiBus network interface. Units are DC-
powered and include reverse polarity protection. Inputs (as a group),
network, and power are isolated from each other. Non-volatile
reprogrammable memory in the module stores configuration and calibration
information.
The ProfiBus model prefix “900” denotes the Series 900. The “PB” suffix
denotes ProfiBus. Select 961PB for current input, and 962PB for voltage
input. The four digit suffix of this model number represents the following
options, respectively: “2” = ProfiBus DP; “0” = Default; “06” = 6 Channels.
Up to six process current or voltage input channels, according to model
number. The unit can be configured to accept one of several input ranges at
each group of 3 channels as described below. The unit must be wired and
configured for the intended input type and range (see Connections Section
for details). The following paragraphs summarize this model’s input types,
ranges, and applicable specifications.
DC Current (961PB Only): Configurable for 0 to 20mA, 4-20mA,
0-11.17mA, and 0-1mA DC nominal input ranges. A precision 24.9
current sink resistor converts the input current to a voltage that is
processed by the A/D converter. An optional external sensor is
required to monitor AC current signals (Acromag Model 5020-350).
This sensor generates a DC milliampere signal of 0 to 11.17mA for the
module (see Table 1 below for scaling to AC current).
Current Input Reference Test Conditions: 4 to 20mA current input;
ambient temperature = 25C; 24VDC supply.
Input Overvoltage Protection: Bipolar Transient Voltage Suppressers
(TVS), 5.2V clamp level typical.
AC Current Sensor (Model 5020-350, For Use With 961PB): This
sensor is a toroidal instrument transformer that converts a sinusoidal
50-60Hz AC current signal into a low level DC milliampere signal of 0 to
11.17mA. The input AC current range is a function of the number of
turns placed through the toroid as shown in Table 1 below. This sensor
is isolated and requires no calibration or adjustment. When used with a
961PB module, it provides redundant input isolation and may facilitate
input-to-input isolation of this six channel unit.
Table 1: AC Current Sensor Turns & Range
AC Current
Input Range
Primary Turns
Sensor Output
(Red/Black Wires)
0 to 20A AC
1
0 to 11.17mA DC
0 to 10A AC
2
“
0 to 5A AC
4
“
0 to 2A AC
10
“
0 to 1A AC
20
“
The output wires of this sensor are polarized with red as (+) plus and
black as (-) minus. Normally these output wires are attached to one
end of a user supplied cable while the other end connects to the
961PB’s process current input terminals.
SPECIFICATIONS
Model Numbers
961PB-2006 (Current)
962PB-2006 (Voltage)
Analog Inputs

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Input Burden: A function of the wire gauge resistance used for primary
turns (the current carrying wire being monitored).
AC Current Sensor to Transmitter Wiring Distance: 400 feet
maximum for 18 gauge wire. Other wire gauges can be used as long
as the resistance of both wires is less than 5.
Input Overload: The AC current sensor will withstand overload
conditions as follows:
20 times full scale for 0.01 seconds.
10 times full scale for 0.1 seconds.
5 times full scale for 1.0 second.
DC Voltage (962PB Only): A 10:1 input divider is installed at the input
(utilizing divider resistor values of 100K and 10.5K). User-configurable
for the nominal bipolar DC voltage ranges of 10V, 5V, 2.5V, 1.25V,
625mV, 313mV, 156mV, and 78mV DC.
Input Impedance: 110.5K.
Voltage Input Reference Test Conditions: -10 to 10V DC input;
ambient temperature = 25C; 24VDC supply.
Input Overvoltage Protection: Bipolar Transient Voltage Suppressers
(TVS), 18V clamp level typical.
Accuracy: Better than 0.05% of span, typical for nominal input ranges
(except 0-1mA). This includes the effects of repeatability, terminal point
conformity, and linearization, but does not include sensor error.
Measurement Temperature Drift: Better than 50ppm/C (±0.005%/C).
Analog to Digital Converter (A/D): A 16-bit -converter.
Resolution: 0.005% or 1 part in 20000 (961PB), 0.0025% or 1 part in
40000 (962PB, full bipolar range).
Input Conversion Rate: 80ms per channel, or 480ms for six input channels.
Input Filter: Normal mode filtering, plus digital filtering optimized and fixed
per input range within the -ADC.
Input Filter Bandwidth: -3dB at 3Hz, typical.
Noise Rejection (Normal Mode): 40dB @ 60Hz, typical with 100input
unbalance.
Noise Rejection (Common Mode): 140dB @ 60Hz, typical with 100input
unbalance.
ProfiBus Trade Organization (PTO): Certified.
Safety Approvals: CE marked (EMC Directive 89/336/EEC); UL Listed
(UL508, UL1604); cUL Listed (Canada Standard C22.2, No. 142-
M1987 & 213-M1987); Hazardous Locations: Class 1; Division 2;
Groups A, B, C, and D.
Dimensions: 1.05 inches wide, 4.68 inches tall, 4.35 inches deep. Refer to
the dimensions drawing at the front of this manual.
DIN Rail Mount: Type EN50022; “T” rail (35mm).
I/O Connectors: Removable plug-in type terminal blocks rated for
15A/300V; AWG #12-24 stranded or solid copper wire.
Case Material: Self-extinguishing NYLON type 6.6 polyamide thermoplastic
UL94 V-2, color beige; general purpose NEMA Type 1 enclosure.
Printed Circuit Boards: Military grade FR-4 epoxy glass.
Shipping Weight: 1 pound (0.45 Kg) packed.
Analog Inputs
General Specifications
Agency Approvals
Enclosure and Physical

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Network Connector: 9-pin D-Sub connector (female) with metal housing
and 4-40 jack screw support.
D-Sub Pin
Signal
Description
1
SHLD
Shield (Connect to Earth Ground)
2
NC
No Connection
3
A
Data A (TxD/RxD+)
4
RTS
Request To Send
5
GND
RS485 Logic Ground
6
+5V
+5V
7
NC
No Connection
8
B
Data B (TxD/RxD-)
9
NC
No Connection
Operating Temperature: -25C to +70C (-13F to +158F).
Storage Temperature: -40C to +85C (-40F to +185F).
Relative Humidity: 5 to 95%, non-condensing.
Power Requirements: 11-36V DC SELV (Safety Extra Low Voltage).
Observe proper polarity. Current draw may decrease up to 10% as the
baud rate is increased to 12MB (data below is at 9600 baud).
Supply
961PB-2006 or 962PB-2006 Current Draw (9600bps)
12V
172mA Typical / 195mA Maximum
15V
133mA Typical / 146mA Maximum
24V
83mA Typical / 91mA Maximum
36V
61mA Typical / 67mA Maximum
CAUTION: Risk of Electric Shock –More than one disconnect switch may
be required to de-energize equipment before servicing.
Power Supply Effect:
Volts: Less than 0.001% of output span change per volt for rated
power supply variations.
60/120 Hz Ripple: Less than 0.01% of output span per volt peak-to-
peak of power supply ripple.
Isolation: Input channels (as a group), power, and network circuits are
isolated from each other for common-mode voltages up to 250VAC, or
354V DC off DC power ground, on a continuous basis (will withstand
1500VAC dielectric strength test for one minute without breakdown).
Complies with test requirements of ANSI/ISA-82.01-1988 for voltage
rating specified.
Installation Category: Designed to operate in an Installation in a Pollution
Degree 2 environment with an installation category (over-voltage
category) II rating.
Electromagnetic Interference Immunity (EMI): Measurement shift is less
than 0.25% of input span for interference from switching solenoids,
commutator motors, and drill motors.
Electromagnetic Compatibility (EMC) -
Minimum Immunity Per European Norm EN50082-1:
Electrostatic Discharge (ESD) Immunity: 4KV direct contact and 8KV
air-discharge to the enclosure port per EN61000-4-2.
Radiated Field Immunity (RFI): 10V/M, 80 to 1000MHz AM and
900MHz keyed carrier, per EN61000-4-3 and ENV50204.
Electrical Fast Transient Immunity (EFT): 2KV to power, and 1KV to
signal I/O per EN61000-4-4.
Enclosure and Physical
Environmental
CAUTION: Do not exceed
36VDC peak, to avoid damage
to the module.
External Fuse: Select a high
surge tolerant fuse rated for
1A or less to protect unit.
Note that input channels are
not isolated channel-to-
channel, except for small
common-mode variations less
than ±4V peak.
These limits represent the
minimum requirements of the
standard, but product has
typically been tested to comply
with higher standards in some
cases.

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Conducted RF Immunity (CRFI): 10V rms, 150KHz to 80MHz, per
EN61000-4-6.
Surge Immunity: 0.5KV per EN61000-4-5.
Emissions Per European Norm EN50081-1:
Radiated Frequency Emissions: 30 to 1000MHz per EN55022 Class A
WARNING: This is a Class A product. In a domestic environment, this
product may cause radio interference in which the user may be
required to take adequate measures.
IMPORTANT: Power, input, and output (I/O) wiring must be in accordance
with Class I, Division 2 wiring methods Article 501-4(b) of the National
Electrical Code, NFPA 70 for installations in the U.S., or as specified in
section 18-1J2 of the Canadian Electrical Code for installations within
Canada and in accordance with the authority having jurisdiction.
This equipment is suitable for use in Class I, Division 2, Groups A, B.
C, and D, or non-hazardous locations only.
WARNING –EXPLOSION HAZARD –Substitution of components may
impair suitability for Class I, Division 2.
WARNING –EXPLOSION HAZARD –Do not disconnect equipment unless
power has been switched off or the area is known to be non-hazardous
Interface Standard: 3-wire RS-485 multi-drop, half-duplex (D, D-bar, and
Common), asynchronous.
Command/Response Protocol: Standard ProfiBus DP (Master/Slave)
protocol per European Norm EN50170.
Baud Rate: Supported baud rates are 9600, 19.2K, 45.45K, 93.75K,
187.5K, 500K, 1.5M, 3M, 6M, and 12M bits per second, auto-detected.
Maximum transmission length is dependent on baud rate selection (range
is up to 1200M at 9600bps, or up to 100M at 12Mbps). Refer to the
following table for maximum transmission distances at supported baud
rates using recommended type A (<30pF/M), or alternately type B
(<60pF/M) bus wire (see EN50170):
NETWORK LENGTH
Baud Rate
Type A
Type B
9600 bps
1200M
1200M
19.2K bps
1200M
1200M
≤ 93.75K bps
1200M
1200M
187.5K bps
1000M
600M
500K bps
400M
200M
1.5M bps
200M
NA
≤ 12M bps
100M
NA
Parity: Even parity.
Stop Bits: One.
Communication Distance: Up to 1200 meters without a repeater.
Ident_Number: 0703H (962PB-2006), 0704H (961PB-2006).
GSD File: ACRO0704.GSD (961PB-2006), ACRO0703.GSD (962PB-
2006).
Maximum Message Size: Up to 32 bytes recommended, extendable up to
244 bytes of data/node/message, plus 11 bytes of overhead (frame).
ProfiBus Character: 11 bits (1 start bit + 8 data bits + 1 even parity bit + 1
stop bit). Applies to all bytes, including frame bytes.
Environmental
Communication
Interface

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
___________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[email protected] http://www.acromag.com
19
Bus Idle State: “1” (a start bit causes line to go to “0”). An idle state of at
least 33 Tbits (sync-time) must be provided between messages.
Note: 1Tbit at 12Mbaud = 1/12000000bit/sec = 83nsec.
Address: Set via two rotary hexadecimal switches adjacent to the power
terminals, or alternately via the Set Slave Address command. Valid
setting is 0-125 (7 bits). Address 126 (7EH) is the default factory
address and is reserved for commissioning purposes only. Address
127 (7FH) is reserved by the software as a global address for broadcast
messages. If the address switches are set to 126 upon power-up (or
126-254), then the unit will retrieve its address from its internal
EEPROM rather than the switches. The internal EEPROM setting is
modified via the Set Slave Address command. Powering up with
switches set to 255 (FFH) will cause the internal EEPROM setting to
revert back to 126 (7EH), which may be used to recommission the
module. If both the internal EEPROM address and the switches are set
to 126 upon power-up (this is the initial state from the factory), the
module will await the Set Slave Address command before completing
initialization and assuming the data exchange mode.
IMPORTANT (Address Setting): The internal EEPROM address
setting and external switch setting is 126 from the factory. As such, the
module will await the Set Slave Address command following power-up
and will not proceed to exchange data, unless the external switches are
instead set to an address from 0-125, or the internal setting is changed
to an address from 0-125 via the Set Slave Address command.
Network Capacity: Multi-drop up to 31 modules, plus a host, without a
repeater. Up to 125 modules plus a host if four repeaters are used (one
for every 31 nodes).
Network Termination: Use 220Ω “A” to “B”, plus 390Ω “A” to GND, and
390Ω “B” to +5V. Use ±2%, 0.25W resistors.
LED Indicators:
Run (Green) - Constant ON indicates power is ON and unit is OK.
Flashing ON/OFF indicates unit is performing diagnostics (first few
seconds following power-up), or has failed diagnostics (after a few
seconds).
Bus (Yellow) –ON indicates unit has completed its initialization
sequence and is in the data exchange mode on the network.
Switches:
Slave Address: Two hexadecimal rotary switches are located in the
recessed opening adjacent to the power terminals and represent the
hex MSB & LSB of the 8 bit slave address. See Address above.
I/O values of Acromag 9xxPB modules are represented by the following
simple data types for temperature, percentage, and discrete on/off. Note
that when transferring words, data bytes are transmitted using “Big Endian”
format (MSB first, LSB second).
Communication
Interface
Controls & Indicators
Data Types

BusWorks® 961/962PB Module User’s Manual ProfiBus Differential I/V Input
__________________________________________________________________
_______________________________________________________________________________________
Acromag, Inc. Tel:[phone] Fax:[phone] Email:[e-mail] http://www.acromag.com
20
Data Types
Description
Percentage
(This Model)
A 16-bit signed integer value with resolution of
0.005%/lsb. 20000 is used to represent 100%. For
example, -100%, 0% and +100% are represented by
decimal values –20000, 0, and 20000, respectively. The
full possible range is –163.84% (-32768 decimal) to
+163.835% (+32767 decimal).
Temperature
A 16-bit signed integer value with resolution of 0.1C/lsb.
For example, a value of 12059 is equivalent to 1205.9C,
a value of –187 equals –18.7C. The maximum possible
temperature range is –3276.8C to +3276.7C.
Discrete
A discrete value is generally indicated by a single bit of an
8-bit byte. The bit number/position typically corresponds
to the discrete channel number. Unless otherwise
defined for outputs, a 1 bit means the corresponding
output is closed or ON, a 0 bit means the output is open
or OFF. For active-high inputs, a value of 1 means the
input is in its high state (usually >> 0V), while a value of 0
specifies the input is in its low state (near 0V). For active
low inputs, a value of 1 means the input is ON (active low
near 0V), while a value of 0 specifies the input is OFF or
in its high state (usually >> 0V).
This model includes three user parameterization bytes
(User_Prm_Data) defined as follows:
Byte
Description
Default
0
Do Not Use –Reserved for SPC3 ASIC.
NA
1
Channel 0, 1, 2 Range Select:
00H = 0-20mA (961PB); ±10VDC (962PB)
01H = 4-20mA (961PB); ±5VDC (962PB)
02H = 0-11.17mA (961PB); ±2.5VDC (962PB)
03H = 0-1mA (961PB); ±1.25VDC (962PB)
04H = Not Defined (961PB); ±625mVDC (962PB)
05H = Not Defined (961PB); ±313mVDC (962PB)
06H = Not Defined (961PB); ±156mVDC (962PB)
07H = Not Defined (961PB); ±78mVDC (962PB)
08H –FFH = Not Defined
00H
2
Channel 3, 4, 5 Range Select:
00H = 0-20mA (961PB); ±10VDC (962PB)
01H = 4-20mA (961PB); ±5VDC (962PB)
02H = 0-11.17mA (961PB); ±2.5VDC (962PB)
03H = 0-1mA (961PB); ±1.25VDC (962PB)
04H = Not Defined (961PB); ±625mVDC (962PB)
05H = Not Defined (961PB); ±313mVDC (962PB)
06H = Not Defined (961PB); ±156mVDC (962PB)
07H = Not Defined (961PB); ±78mVDC (962PB)
08H –FFH = Not Defined
00H
3
Writing 55H to this register will cause the module to
restore its original factory calibration. Note that 55H is
not stored, but acts as a trigger, as this byte always
reads as 00H.
00H
4
Factory Use Only –Do Not Modify.
00H
Data Types
Module Specific Parameters (User_Prm_Data)
Note that channels 0, 1, & 2,
and channels 3, 4, & 5 (every
group of 3 channels) share the
same input configuration, but
the configuration may vary
between the two groups. All
parameterization bytes take
effect immediately. This
model does not include any
user defined diagnostic data
(Ext_Diag_Data).