ROC364 Instruction Manual
3-25
Input and Output Modules
Rev Jun/05
3.5.7 Discrete Output Relay Module
Equipment Required:
Multimeter
Personal Computer running ROCLINK configuration software
1.
Place the Discrete Output in manual mode (Scanning Disabled) using ROCLINK configuration
software.
2.
Set the output Status to “Off” and measure the resistance across terminals B and C. A reading of
0 ohms should be obtained.
3.
Measure the resistance across terminals A and B. No continuity should be indicated.
4.
Set the output Status to “On” and measure the resistance across terminals B and C. No continuity
should be indicated.
5.
Measure the resistance across terminals A and B. A reading of 0 ohms should be obtained.
3.5.8 Pulse Input Source and Isolated Modules
Equipment Required:
Pulse Generator
Voltage
Generator
Frequency
Counter
Jumper
wire
For both types of modules, there are two methods of testing.
♦
Testing Pulse Input High-Speed Operation on page 3-25.
♦
Testing Pulse Input Low-Speed Operation on page 3-25.
NOTE:
When checking the operation of the Pulse Input Source and Isolated modules, ensure
the scan rate for the Pulse Input is once every 6.5 seconds or less as set by ROCLINK
configuration software.
3.5.8.1 Testing Pulse Input High-Speed Operation
To verify high-speed operation:
1.
Connect a pulse generator having sufficient output to drive the module to terminals B and C.
2.
Connect a frequency counter across terminals B and C.
3.
Set the pulse generator to a value equal to, or less than 10 kilohertz.
4.
Set the frequency counter to count pulses.
5.
Verify the count read by the counter and the total accumulated count (Accumulated Pulses) read
by the ROC are the same using ROCLINK configuration software.
3.5.8.2 Testing Pulse Input Low-Speed Operation
To verify low-speed operation of the
PI Source
module:
1.
Alternately jumper across terminals B and C.
2.
The module LED should cycle on and off, and the total accumulated count (Accumulated Pulses)
should increase.