Siemens SIMATIC S7 Functional Safety Manual page 179

Table A- 55 Power supply (L+, M)
Model
Voltage range
Surge voltage
Input current
Hold up time (loss of power)
Internal fuse, not replaceable
Reverse polarity protection
Table A- 56 Digital outputs
Model
Number of outputs
Type
Logic 1 signal at maximum current
Logic 1 current
Lamp load
Logic 0 current (residual)
Wire break monitoring
Output overload protection:
M-switch
•
P-switch
•
Current per common (maximum)
Inductive clamp voltage
Behavior on RUN to STOP
Number of outputs on simultaneously
Parallel connection of 2 outputs
Control of a digital input
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
A.3 Fail-Safe signal module (SM) technical specifications
SM 1226 F-DQ 4 x 24 VDC
20.4 VDC to 28.8 VDC
35 VDC for 0.5 s
170 mA (does not include current in all P-switch loads)
None for outputs
•
1.0 ms at 20.4 VDC for internal power
•
1 A for logic power
•
7 A common for P-switch outputs F-DQ a.0 and F-DQ a.1
•
7 A common for P-switch outputs F-DQ a.2 and F-DQ a.3
•
Yes
Note: Refer to "Reverse polarity protection" in the SM 1226
F-DQ 4 x 24 VDC "Digital outputs" table for more information.
SM 1226 F-DQ 4 x 24 VDC
4
P- and M-switching
L+ minus 2.0 VDC (minimum):
P-switch: L+ minus 1.5 VDC (maximum)
•
M-switch: 0.5 VDC (maximum)
•
2 A nominal
•
10 mA to 2.4 A
•
10 W (maximum)
P-switch: 0.5 mA, maximum
•
M-switch: 0.5 mA, maximum
•
None
Yes, electronic in addition to internal non-replaceable fuse.
Threshold of 25 A to 45 A turns M-switch OFF.
Threshold of 2.4 A to 3.8 A, 400 ms time constant filter,
measured at P-switch, turns both switches OFF.
7 A fuse can open for large faults.
Note: Refer to "Fuse and electronic overload protection"
(Page 180) for more information.
8 A
M-switch: + 48 VDC referenced to M
•
P-switch: - 26 VDC referenced to M
•
Only 0 (OFF) is allowed
4 at 55 °C horizontal or 45 °C vertical
Not possible
Not possible
Technical specifications
179