B872-100 Quick Start Test
(Original Document)
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This test configures the module as follows: B872 (analog 4 channel output), and output state set to RTZ (return-to-zero).
Required Parts
Before starting, make sure you have the following items:
Configuration Switch
The following table gives the procedure for setting the configuration switch:
Step
Action
1
Set the 4 position DIP-switch as follows: (viewing the rear of the module when held vertically)
SW1,2,3,&4......Left......RTZ
2
With a resistance decade box, or two paralleled 510 Ω resistors, wire the output module as shown in the following figure, for current sinking, or the next figure, for current sourcing on a AS-8535-000 high density connector.
Note: The resistance decade box should be set for 249 Ω.
Note: Remove the keying tabs on the AS-8535-000 high density connector prior to installing module.
The following figure shows the wiring for current sinking.
3
Determine which channel and slot location are being used for this module.
4
Stop the controller, and remove AC power.
The following figure illustrates Current Output #2 (sourcing)
5
Insert the module into the rack.
6
Re-apply AC power, attach programmer, and access the I/O Map.
7
Map the module as a B872, registers 40001-40004 binary.
8
Start the controller.
9
Confirm that the module's active light is illuminated.
Note: Active on steady = OK.
10
Access the programming software. Enter a value of 2048 in any or all of the declared 4xxxx registers in the I/O Map assigned to the module.
11
Using the monitor terminals for each output, measure what should be 3 Vdc. This value is equivalent to 12 mA of current in the loop. Refer to the table below.
12
Continue to provide your output registers with values from Table 2. This assures each output is capable of a span of 4-20 mA.
Note: When using the two resistors in lieu of a decade box, your voltage monitor readings may vary slightly, because of the value and tolerance of the component.
Current and Monitor Voltage
The following table shows the relationship between current and monitor voltage.
Register Value
Loop Current
Monitor Voltage
4xxxx=0001
4 mA
1.0 V
4xxxx=1024
8 mA
2.0 V
4xxxx=2048
12 mA
3.0 V
4xxxx=3071
16 mA
4.0 V
4xxxx=4095
20 mA-1 LSB
5.0 V-1 LSB