TROUBLESHOOTING
ERROR INDICATIONS AND CORRECTIVE ACTION
5 - 2
I-E96-316A
®
Function Code (FC) 79 output block N+9 in the MFP configura-
tion is the QRS status flag (logic 0=good; logic 1=bad). You can
use an operator interface to monitor this block. If the status
flag is a logic 1, check the front panel module status LED and
the operator interface report function to determine corrective
actions.
NOTE: If FC 79 specification 19 is set to 0, the MFP will trip when
the QRS module fails or the analog input reference voltages are out
of tolerance. Changing specification 19 to a 1 allows the MFP to
continue to operate if any QRS error condition exists.
ANALOG INPUT REFERENCE ERROR
The MFP generates an ANALOG INPUT REFERENCE ERROR if
the QRS reference voltages (1 VDC and 5 VDC) used to cali-
brate the analog input zero offset and gain are not within toler-
ance or the analog inputs are not within QRS tolerance.
1. Check the analog inputs to verify that their voltages are
within QRS specifications (1 to 5 VDC).
2. Check the analog inputs to verify that their common mode
voltage is within QRS specifications (
±
10 VDC).
If the analog inputs are correct, replace the QRS.
MISSING SLAVE MODULE ERROR
The address set on address switch (S1) and in the MFP config-
uration must be the same. The MFP generates a MISSING
SLAVE MODULE error if they do not match. Verify that the
address set on S1 is the same as the address in FC 79 specifi-
cation 1. If not:
1. Remove the module and change the setting of S1 to corre-
spond with the MFP configuration (refer to
for the
procedures to set an address and to install a slave module).
Off
(contunued)
No power to slave module Module not completely
inserted in MMU
Verify module is completely
inserted in MMU: faceplate flush
with MMU and captive retaining
screws latched
Red
Bus fault timer error
(
time-out)
Slave expander bus clock
failure
Check MFP module for proper
operation
Dipshunt not installed
between MFP and slave
module
Verify dipshunt is installed in the
slave expander bus socket on the
MMU backplane between MFP
and slave module
Table 5-1. Status LED Indications and Corrective Actions
(continued)
LED State
Indication
Probable Cause
Corrective Action
