GAI-Tronics 12578-003 Monitored Input Module (MIM) - Manual (Page 10)

Pub. 42004-715L2C
Model 12578-003 Monitored Input Module (MIM) Page 10 of 12
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Operation
The operation of the Model 12578-003 MIM is controlled by the MCU configuration. See the MCU
configuration details in the system manual for all operation information.
How to Diagnose Assembly/Model Faults
Symptom Action
MIM does not
communicate
with MCU  Verify power is applied to the MIM.
 Verify page line is connected to the MIM.
 Verify address of MIM agrees with the setup configuration.
 Ensure CPU PCBA is correctly connected via J1.
 Call for service of the MIM.
MIM does not
recognize dry
inputs  Verify total loop resistance is less than 100 .
 Verify power is applied to the MIM.
 Verify page line is connected to the MIM.
 Verify end of line resistor(s) properly installed on each input circuit.
 Call for service of the MIM.
MIM does not
activate an
alarm with 24 V
dc applied to
input terminal.
(Wet contact
mode ONLY.)
 Verify that the jumper that selects the proper “_ V dc when active” mode is in
the correct position for the desired mode. Refer to Mode 5 - IDC Non-
Supervision (Wet Contact) information.
 Verify that the applicable input jumpers have been repositioned for WET
operation.
 Verify that the input is within the acceptable dc voltage range (20–30 V dc)
 Verify that the proper voltage polarity has been observed for external
connections to the input terminals.
 Call for service of the MIM.