Delta AH500 Manual page 681

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The display mechanism of the digital display:
 When AHRTU-PFBS-5A is in normal state and the master PLC is in RUN state, the digital
display of AHRTU-PFBS-5A only displays its node address.
 When AHRTU-PFBS-5A is in normal state and the master PLC is in STOP state, the digital
display of AHRTU-PFBS-5A displays its node address and 80 (the STOP state code of the
master PLC) alternately.
 When AHRTU-PFBS-5A is initializing or the master PLC is in RUN state, the digital display
of AHRTU-PFBS-5A displays its node address, initialization code and the error code
alternately.
 When the I/O module connected to AHRTU-PFBS-5A alarms or is offline and meanwhile the
master PLC is in RUN state, the display of AHRTU-PFBS-5A displays the position of I/O
module and error code E4; when the extension rack alarms or is offline, AHRTU-PFBS-5A
displays its node address and error code E5 alternately.
 When an error occurs in multiple I/O modules or extension rack or the master PLC is in
RUN state, the display of AHRTU-PFBS-5A displays the error codes in cycle. For example,
E4 12 E5 02, E4 12 E5 02 appears, the meaning of the error is shown below.
1. E4 indicates that the actual I/O module connected to the rack is not consistent with that
configured in the software.
2. The 12 represents the position of the module in which the fault occurs. The first number
is the number of the extension rack and the second number is the number of the slot, for
example, 12 stands for the module of the rack 1 and slot 2. (The number of rack is 1~8. 1
represents the main rack and 2~8 refer to the extension racks. The number of slot is
0~11.)
3. E5 means that the extension rack has a fault or is offline.
4. The 02 indicates that an error occurs or the number of the offline rack. (The number of
rack is 1~8. 1 represents the main rack and 2~8 refer to the extension racks.)
Chapter 14 Remote I/O Communication Module AHRTU-PFBS
14-51