Siemens SIMATIC ET 200AL System Manual page 281

The following table is used to explain the channel error entries.
Channel number
Channel properties
Channel error type
IM 157-1 DP (6ES7157-1AA00-0AB0)
Equipment Manual, 08/2021, A5E32100641-AE
Interrupts, error messages, diagnostics and system alarms
Description
0 ... 63: Channel number for channel error
0x8000: Entire submodule
Bits 0 to 7 00 : Free data type
H
01 : bit
H
02 : 2 bit
H
03 : 4 bit
H
04 : byte
H
05 : word
H
06 : double word
H
07 to FF : Reserved
H H
Bit 8 0: Channel
1: Channel group
Bit 9, 10 00 : Diagnostics
H
01 : Maintenance demanded
H
02 : Maintenance required
H
03 : Reserved
H
Bit 11, 12 00 : Channel error-free
H
01 : Incoming diagnostics
H
02 : Outgoing diagnostics
H
03 : Outgoing diagnostics, but other diagnostics are also
H
pending on this channel
Bits 13 to 15 00 : Reserved
H
01 : Input channel
H
02 : Output channel
H
03 : Input/output channel
H
Explanations are available in the device manuals, in the section "Diagnostic
alarms".
5.2 Interrupts
31