Siemens SIMATIC PCS 7 Operating Manual page 148

Configuring the safety program
7.11 Monitoring times and system response times
Module
EM 4 F-DO Ex 17.4V/40mA
6ES7138-7FD00-0AB0
EM 4 F-AI Ex HART
6ES7138-7FA00-0AB0
148
Acknowledgment time in safety mode
Max. 59 ms
Typ. response time (when no errors present) = conversion cycle time ×
•
filter
Max. response time (when no errors resent) = 2 × conversion cycle time ×
•
filter
Integration time
•
– At 50 Hz 20 ms
– At 60 Hz 16.67 ms
Response time per channel
•
– At 50 Hz 23 ms
– At 60 Hz 20 ms
Basic response time: 17 ms
•
Conversion cycle time = basic response time + (n x response time per
•
channel)
(n = number of active channels)
Conversion cycle time at 50 Hz, all channels active: 109 ms
•
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB