Cycle and Response Times of the S7-400
9.11 CBA response times
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
9-29
General Information about Achievable CBA Response Times
● The CBA response time increases if the CPU is performing additional tasks, such as
programmed block communication or S7 connections.
● If you frequently call SFCs "PN_IN", "PN_OUT" or "PN_DP", you increase the CBA
processing times and therefore increase CBA response time.
● A very small OB1 cycle increases the CBA response time when the PN interface is
updated automatically (at the cycle control point).