Other signal modules
7.4 Position decoder module SM 338; POS-INPUT; (6ES7338-4BC01-0AB0)
S7-300 Automation System Module data
7-20 Manual, 08/2006, A5E00105505-04
Diagnostics message LED Scope of diagnostics
Channel information available SF Module
Watchdog time-out SF Module
Channel error SF Channel (encoder input)
Configuration / programming error SF Channel (encoder input)
External channel error (encoder error) SF Channel (encoder input)
Causes of error and troubleshooting
Table 7-6 Diagnostics messages of SM 338, causes of error and troubleshooting
Diagnostics message Possible cause of error To correct or avoid error
Module error Any, the module has detected an error.
Internal error Module has detected an error within the
automation system.
External error Module has detected an error outside of the
automation system.
Channel error Indicates that only specific channels are
faulty.
External auxiliary voltage
missing
Supply voltage L+ of the module is missing Connect supply L+
Module not programmed Module requires information whether it
should operate with default system
parameters or user parameters.
Message present after power on, until the
CPU has completed the transfer of
parameters; configure the module as required.
Incorrect parameters One parameter, or the combination of
parameters, is not plausible
Program the module
Channel information
available
Channel error; module can provide additional
channel information.
Watchdog time-out Infrequent high electromagnetic interference Eliminate interference
Channel error Any, the module has detected an error at the
encoder input.
Configuration /
programming error
Illegal parameter transferred to module Program the module
External channel error
(encoder error)
Wire-break at encoder cable, encoder cable
not connected, or encoder defective.
Check connected encoder
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