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T-Guard2_Operating-instructions-jina85en1-13-(2009)
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7.1.2 Allocation of functions for PLC output
Using a graphic, you can change the allocation of functions for the output and then
test it.
► In the main menu, select “Settings > Interfaces > Define PLC outputs”.
Fig. 27: User-defined allocation of functions, PLC outputs
Change an allocation as follows:
1. Select a pin with the up and down keys on the left side.
2. Select the desired function with the up and down keys on the right side.
3. Confirm with “OK”. An overview with all selected functions is displayed.
4. Check the allocations and press “OK” again to confirm.
The current state of all inputs and outputs is displayed. The relays can be switched for
testing:
1. Select “Test PLC output”.
2. Using the arrow keys, navigate to the output you want to test.
3. Select “Switch relay”.
PLC outputs 8 to 11 are connected to LEDs 1 to 4.
The measured leak rate is measured at the analogue output,
Function
Meaning
OPEN
Low resistance, for test purposes
CLOSE
High resistance, for test purposes
TRIGGER 1
Low resistance means that trigger value 1 has been exceeded.
TRIGGER 2
Low resistance means that trigger value 2 has been exceeded.
READY
Low resistance means that the device is ready for the next
measurement. For a continuous measurement, the T-Guard2
measures the reference line.
CYCLE
ACTIVE
Low resistance means that the device is currently carrying out a
measurement cycle. For a carrier gas measurement, automatic
purging and the reference measurement are included. For a
continuous measurement, there is no measurement cycle; the
output is therefore always high resistance.
