Siemens SIMATIC ET 200AL, System Manual

Page: 1964 / 2255

Functions
5.1 Isochronous mode
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
67
5.1.6 Configuring isochronous mode
Introduction
A SIMATIC automation solution can be connected to the isochronous PROFIBUS with the
isochronous mode function. Isochronous mode guarantees the synchronous reading of input
data, the processing and output of output data at the same (isochronous) intervals.
Basic procedure for configuration of isochronous mode
1. Setting the properties for isochronous mode on the DP slave:
–
Isochronous DP cycle
– Isochronous mode of the modules
2. Setting the properties for isochronous mode on the modules:
–
Synchronous cycle interrupt (SynchronousCycle)
– Process image partition
– Input delay
3. Create user program with access to isochronous I/O
Requirement
● The network view in STEP 7 is open.
● A CPU has been placed (e.g., CPU 1516-3 PN/DP).
● An interface module has been placed and networked with the CPU (e.g., IM 151-1 HF).
● I/O modules have been placed (e.g., 2DI x DC24V HF and 2DO x DC24V/0,5A HF).