Configuring And Reconfiguring The Ip 267 - Siemens SIMATIC S5 Manual

Application Examples
6.1

Configuring and Reconfiguring the IP 267

In the following example, the IP 267 is configured with new data at each cold re-
start or warm restart.
A configuration always requires two subsequent message frames. The first
message frame deletes the current IP 267 configuration data and the second
reconfigures the IP 267.
Data is exchanged between the IP 267 and the CPU exclusively via the process I/O
images (PII and PIQ). The PIQ must contain the complete message frame and the
first OB 1 scan must be complete before the second message frame is then
transferred to output words QW 88 and QW 90 in the next program scan. Other-
wise the IP 267 receives only the second message frame. If the old data is still
available in the IP 267, the second message frame is interpreted as a positioning
job with the "STOP" mode and not as the configuration message frame.
Please note the following when programming warm restart routines in OB 21 or
OB 22:
• After switching on the CPU, the configuration message frame at the end of
the first OB 1 scan is transferred to the IP. The message frame may not be
changed during the first OB1 processing.
• Overall reset of the IP 267 occurs after power failure and can be reconfigured
with OB 22.
• The PIQ is reset in the case of manual cold restart and the IP configuration
data is still available. This configuration data can only be deleted if the
contents of the PIQ are still reset after the first cyclic scan of OB 1. Otherwise
the IP 267 interprets a configuration message frame in OB 21 as being a
positioning job with "STOP" mode ( 6.1.1)
6-2
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EWA 4NEB 812 6061-02a
IP 267