Siemens SIMATIC S7 - SMB6-SMB7: CPU ID, Error Status, and Digital I;O Points

Special memory (SM) and system symbol names
D.8 SMB6-SMB7: CPU ID, error status, and digital I/O points
S7-200 SMART
806 System Manual, V2.3, 07/2017, A5E03822230-AF
D.8
SMB6-SMB7: CPU ID, error status, and digital I/O points
Special memory bytes 6 and 7 provide CPU information.
S7-200
SMART
symbol
name
SM address
Read-only SMB6 and SMB7 (CPU ID, error status, and digital I/O point)
CPU_ID SMB6
MSB
LSB
7 0
1
x
x
x
c
d
0
0
SM6.4 to
SM6.6
0
0
0
= CPU CR20s
0
0
1
= CPU CR40s
0
1
0
= CPU CR60s
0
1
1
= CPU SR20 / ST20
1
0
0
= CPU SR40 / ST40
1
0
1
= CPU SR60 / ST60
1
1
0
= CPU CR30s
1
1
1
= CPU SR30 / ST30
SM6.2 to
SM6.3
c Configuration / parameterization
error
0 = no error, 1 = error
d Diagnostic alarm (See SMW100 for
alarm codes)
0 = no error, 1 = error
CPU_IO SMB7
MSB
LSB
7
0
i
i
i
i
q
q
q
q
SM7.0 to
SM7.7
i
i
i
i
0 to 15 bytes of digital input points
q
q
q
q
0 to 15 bytes of digital output points
See also
SMW100-SMW114 System alarm codes (Page 822)