Siemens S7-300 Installation And Operating Manual page 140

Digital modules
8.5 SM 326; DO 8 x DC 24V/2A PM
Internal limit of the inductive shutdown voltage
Short-circuit protection of output

Actuator timing requirements
Wire break detection


Time, Frequency
Internal signal preparation time in safety mode
Acknowledgment time in safety mode
Note
The maximum cable lengths currently specified in this manual ensure against functional
impairment, even without more precise examination of the boundary conditions. If the
boundary conditions, such as EMC, cable type, cable routing, etc. are examined more
closely, longer cables can be used for all F-SMs.
140
Response threshold
For "1" signal
For "0" signal
Technical data
Typical L+ (-33 V)
Yes, electronic
2.6 to 4.5 A
Actuator must not react within dark period < 1 ms
(see also chapter "Sensor and Actuator
Requirements for F-SMs in Safety Mode
(Page 47)")
1 s
100 s
Min. 4 ms
Max. 14 ms
Max. 18 ms
Installation and Operating Manual, 01/2010, A5E00085586-10
Fail-safe signal modules