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M4RTU/M4IO TROUBLESHOOTING CHART
Indication
Digital input is not working.
Digital input test with G4SWIN mod-
ule installed.
Analog output is not working.
Analog input is not working.
58
M4RTU/M4IO User's Guide
Condition/Problem
Input device is not working prop-
erly.
Wrong module type.
Voltage on input is not compatible
with module voltage range.
I/O or processor board is bad.
I/O or processor board is bad.
Output is wired incorrectly. Device
is not properly matched to module
type.
I/O or processor board is bad.
Voltage output device is wired
incorrectly.
Thermocouple has a break.
RTD has open or incorrect wiring.
I/O or processor board is bad.
Action
Check input device wiring and power source. Rewire,
replace, or fix power source as needed.
Make sure module is 5V (for example, [G4IDC5 is correct,
G4IDC24] is incorrect).
Change voltage to match module or module to match volt-
age.
Use G4SWIN module and OptoControl or G4TEST to send
commands to the M4RTU/M4IO to verify that the processor
board and I/O board are working properly.
Contact Opto 22 Product Support (see
Check wiring to output device. Test module using meter
and test software (OptoControl or G4TEST). Change volt-
age to match module or module to match voltage.
Contact Opto 22 if meter reading does not change with
value change in test software.
Check device and wiring. Connect voltage source or cur-
rent source (depending on input type) and use test soft-
ware to determine if input is functioning.
For a thermocouple, check for continuity across test points
next to module.
For an RTD input, check resistance across test points next
to module.
Contact Opto 22 Product Support
lowing occurs:
- If value in test software does not change with input when
testing input voltage or current with test software.
- If thermocouple has continuity across test points.
- If resistance across test points is about 100 ohms for RTD
input.
page
2).
(page
2) if any of the fol-
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