GE VMIVME-3419 Gas turbine output card

In this chapter you will learn how to troubleshoot your VHSC module using the indicators on the front of the module, and the troubleshooting flowchart. The indicators on the front of the module are an aid in troubleshooting. 

These indicators consist of: 

• active indicator 

• input indicators 

• output indicators 

• fault indicator 

The active indicator is on when the module has successfully powered up. When an input indicator (A, B) is on, it indicates that the input is high. When the output indicator is on, it indicates that the module has commanded the output to be on. When a gate/reset indicator (G) is on, its input is high. Since that signal can be inverted, it does not indicate whether the signal on that terminal is necessarily logically true.

Addditional Sample Program for PLC-5 Family Processors 

EN BTR BLOCK XFER READ RACK: GROUP: MODULE: CONTROL: 0 0 0 N21:0 DN DATA FILE: LENGTH: CONTINUOUS: N22:101 0 N ER EN BTW BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: 0 0 0 N21:5 DN DATA FILE: LENGTH: CONTINUOUS: N22:1 0 N ER N21:0 15 N22:101 0 N21:5 15 This block transfer read rung can be used alone or with the block transfer write rung shown below. If used alone, all VHSC counters will operate in a default mode of outputs disabled, rollover at 999,999 and count mode with pulses counted on channel A, direction sensed at channel B and the gate is not active.If the default module operation is acceptable, this rung can be optional. If it is necessary to reconfigure, this rung will automatically send a new configuration to the module (using the module configured bit N22:101/0 in the BTR file). This will occur on power up and each time the processor is changed from program to run mode. The optional user bit I:001/07 can also configure the module at any time. Not enabling the BTW can increase throughput of the read.

Application Considerations 

This appendix will provide you with background for selecting the appropriate input device for your 1771-VHSC module, explain the output circuit, and provide you with information for selecting the type and length of input cabling. To turn on an input circuit in the VHSC module, you must source current through the input resistors sufficient to turn on the opto-isolator in the circuit.

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