Siemens 6ES7153-1AA03-0XB0 - Structure of the IM 153-2 Messages

Functions
8.2 Time stamping the input signals with IM 153-2
ET 200M
Operating Instructions, 04/2022, EWA-4NEB7806006-09
153
8.2.4.7 Structure of the IM 153-2 messages
The IM 153-2 makes available 15 data records for saving stamped input signals (signal
messages) and special messages (DS 100 to DS 114). A maximum of 20 signal and special
messages each consisting of 12 bytes can be saved in a data record.
Structure of the message frame header
Each message frame with a data record has 4 bytes of header data:
Table 8- 5 Header data of the IM 153-2 message frame (example)
Byte
Contents
Meaning
0
5Eh
Read data record
1
00h
IM 153-2 slot
2
64h
Number of the data record (e.g. 100 dec.)
3
0Ch
Number of the following bytes (e.g. 12 dec.)
Structure of the signal message
A signal message can come from modules on the slots 4 to 11. It is structured as follows:
Table 8- 6 Structure of the signal message
Meaning Number of
bytes
Remarks
Slot number of the DI
module
1
Together with the channel number for addressing the digital signal
Range of values:
0 … 3
Unassigned
4 … 11
Slot number of the DI module
12 … 255
Unassigned
Channel number of the DI
module
1
Together with the slot number for addressing the digital signal
Range of values:
0 … 15
Channel number of the DI module
16 … 255
Unassigned
Signal status
1
Bit 7
1: Signal incoming
0: Signal outgoing
Bit 6 … Bit 0
Unassigned
Reserved
1
Unassigned
Time of the signal change
8 (2 DW)
Time stamp in ISP-format
(refer to table below for structure)