Smb8 To Smb21: I/O Module Id And Error Registers; Special Memory Bytes Smb8 To Smb21 - Siemens SIMATIC S7-200 System Manual
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SMB8 to SMB21: I/O Module ID and Error Registers
SMB8 through SMB21 are organized in byte pairs for expansion modules 0 to 6.
As described in Table C-8, the even-numbered byte of each pair is the
module-identification register. These bytes identify the module type, the I/O type,
and the number of inputs and outputs. The odd-numbered byte of each pair is the
module error register. These bytes provide an indication of any errors detected in
the I/O for that module.
Table C-8
SM Byte
Format
SMB8
SMB9
SMB10
SMB11
SMB12
SMB13
SMB14
SMB15
SMB16
SMB17
SMB18
SMB19
SMB20
SMB21
S7-200 Programmable Controller System Manual
A5E00066097-02
Special Memory Bytes SMB8 to SMB21
Even-Number Byte: Module ID Register
MSB
7
M t
t
A
i
i
M:
Module present 0 = Present
1 = Not present
tt:
00
Non-intelligent I/O module
01
Intelligent module
10
Reserved
11
Reserved
A:
I/O type
0 = Discrete
1 = Analog
ii:
00
No inputs
01
2 AI or 8 DI
10
4 AI or 16 DI
11
8 AI or 32 DI
QQ: 00
No outputs
01
2 AQ or 8 DQ
10
4 AQ or 16 DQ
11
8 AQ or 32 DQ
Module 0 ID register
Module 0 error register
Module 1 ID register
Module 1 error register
Module 2 ID register
Module 2 error register
Module 3 ID register
Module 3 error register
Module 4 ID register
Module 4 error register
Module 5 ID register
Module 5 error register
Module 6 ID register
Module 6 error register
Special Memory (SM) Bits
Description (Read Only)
Odd-Number Byte: Module Error Register
LSB
MSB
0
7
Q Q
C 0
C:
b:
r:
P:
f:
t:
LSB
0
0
b
r
P
f
t
Configuration error
bus fault or parity error
Out-of-range error
No user power error
Blown fuse error
Terminal block loose
error
C-5
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