208 Diagnostics
WAGO-I/O-SYSTEM 750
750-882 Media Redundancy ETHERNET Controller
Manual
1.5.0
11.2.2 Local Bus Failure
I/O LED indicates a local bus failure.
I/O LED flashes red:
When a local bus failure occurs, the fieldbus controller generates an error
message (error code and error argument).
An local bus failure occurs, for example, if an I/O module is removed.
If the error occurs during operation, the output modules operate as they do during
an local bus stop.
If the local bus error is resolved, the fieldbus controller starts up after turning the
power off and on similar to that of a normal start-up. The process data is
transmitted again and the outputs of the node are set accordingly.
If the “KBUS_ERROR_INFORMATION” function block is evaluated in the control
program, then the “ERROR”, ”BITLEN”, “TERMINALS” and ”FAILADDRESS”
output values are relevant.
ERROR
= FALSE
= No error
(BITLEN
= Bit length of the local bus shift register
TERMINALS = Number of I/O modules)
ERROR
= TRUE
= Local Bus Error
(BITLEN
= 0
TERMINALS = 0
FAILADRESS
= Position of the I/O module after which the
local bus interruption arose, similar to the
flashed error argument of the I/O LED)