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5-17GFK-0787B Chapter 5 Diagnostics
Displaying Additional Fault Information About I/O Faults (with CTRL/F)
Pressing the programmer CTRL/F keys provides more information about a fault. Entries
that apply to the GMR system are described below.
Fault Description:
Code (Hex) Meaning
00 Loss of Device
F0 Digital Input Autotest Fault
F1 Digital Input Discrepancy Fault
F2 Digital Output Autotest Fault
F3 Digital Output Discrepancy Fault
F4 Analog Input Discrepancy Fault
FF GMR I/O Fault
Fault Specific Data:
Loss of Device Byte 1
Bytes 2 – 5
= 84 (Hex)
= Always 0
Digital Input Discrepancy Byte 1 – 5 = Always 0
Input Autotest Byte 1
Bytes 2 and 3
Byte 4
Byte 5
= Master PLC (AA, BB, or CC (Hex)
= Always 0
= Fail State : (01 = input stuck at 0
(02 = input stuck at 1
= Always 0
Analog Input Discrepancy Byte 1 – 5 = Always 0
Output Autotest Byte 1
Bytes 2 and 3
Byte 4
Byte 5
= Master PLC (AA, BB, or CC (Hex)
= Always 0
= Fault type (see below)
= Always 0
Output Discrepancy Byte 1
Bytes 2 and 3
Byte 4
Byte 5
= Master PLC (AA, BB, or CC (Hex)
= Always 0
= discrepant PLC (AA, BB, or CC (Hex)
= Always 0
Analog Input Discrepancy Byte 1 – 5 = Always 0
GMR I/O Fault Byte 1
Bytes 2 and 3
Byte 4
Byte 5
= Master PLC (AA, BB, or CC (Hex)
= Always 0
= 1 (Logon fault)
= discrepant PLC (AA, BB, or CC (Hex)
Fault Type for Output Autotest
For Output Autotest, the Fault Type byte may have the following content (hex values):
11 Block A & B short circuit to 0V 22 Block B switch failed off
12 Block C & D short circuit to +24V 23 Block C switch failed off
13 Block A cannot turn on 24 Block D switch failed off
14 Block B cannot turn on 25 Block A not connected to Block B
15 Block C cannot turn on 26 Block C not connected to Block D
16 Block D cannot turn on 27 Block A cannot turn off
17 Load disconnection 28 Block B cannot turn off
18 No Load connection on Block A 29 Block A & B cannot turn off
19 No Load connection on Block B 2A Block C cannot turn off
1A No Load connection on Block C 2B Block D cannot turn off
1B No Load connection on Block D 2C Block C & D cannot turn off
1C Inconsistent No Load reporting 30 Force override (spurious trip)
21 Block A switch failed off