Chapter 10 Maintenance
XBC E-Type Main Unit
10-25
Ver. 1
10.8 Diagnosis of External Device
This flag is provided for a user to diagnose any fault of external device and, in turn, execute halt or warning of
the system. Use of this flag displays faults of external device without any complicated program prepared and
monitors fault location without any specific device (XG5000 and etc) or source program.
1. Detection of faults in external device
a. The fault of external device may be detected by user program and categorized,
depending on the type, into error and warning; the former requires halt of PLC operation
and the latter simply displays the status while PLC keeps working.
b. ‘Error’ uses ‘F202 (_ANC_ERR)’ and ‘Warning’ uses ‘F203 (_ANC_WB) flag’.
c. As the detection request flag, ’Error’ uses ‘F2002 (_CHK_ANC_ERR) flag’ while
‘Warning’ uses ‘F2003 (_CHK_ANC_WB) flag’.
2. Troubleshooting external device
a. When detecting any trouble of external device in user program, it writes a value except
‘0’ by classifying the type, which is defined by a user in ‘F202 (_ANC_ERR)’ while the
detection request flag checks it at the time when the program ends with ‘F2002
(_CHK_ANC_ERR) On, and PLC outputs based on the “Emergency Output” setting in
I/O parameter, making it as the same error status as detected by PLC itself.
b. If any trouble occurs, a user may identify the cause by using XG5000 and alternatively
by monitoring ‘F202 (_ANC_ERR) flag’.
c. Example
d. If any trouble occurs, CPU is in error status and operation halts. At this moment, F2020
and F2002 flags are off (error LED switches on and off every second.)
FSET F2020
M000
FSET F2002
Error device bit On
Summary of Contents for XBC-DN10E
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