Siemens SIMATIC S5 Manual page 69
Ip 267
stepper motor controller
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- Manual (396 pages) ,
- Equipment manual (197 pages) ,
- Operating instructions manual (43 pages)
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IP 267
The various interrupts are separated by a delay of approximately 850 µs during
which the cyclic program is processed. This corresponds to approximately 10
statements in the case of the CPU 100. Processing of an output message can lead
to errors under certain circumstances if a new "Start forwards" command is
transferred from the PIQ to the IP 267 and is already being processed even
though the relevant new path is not yet available, e.g. because an OB1 scan was
completed during the interrupt sequence.
Note:
Configuring messages and positioning message frames must be transferred
from the programmer/OP to the PIQ in one scan, otherwise the desired IP 267
response is not guaranteed.
You can use the following programming mode to ensure that output messages
are only processed en bloc, i.e. they are only transferred to the IP 267 when they
are complete in the PIQ.
OB 1
:
:
:
A
F 0.0
JC PB1
:
:
The data (QW88, QW90) is not written direct into the PIQ from the operator
panel but in data words (DW10, DW12). Only then can you set flag F 0.0 on the
operator panel. By doing so you make sure that PB1 can only be called if all the
data is valid. The data is then transferred en bloc by PB1 to the PIQ and,
consequently, to the IP.
If F 0.0 is set immediately in the operator panel display, the conditional jump to
PB1 can take place before data words DW 10 and DW 12 contain the desired data.
EWA 4NEB 812 6061-02a
Notes on Operation
PB 1
R
F 0.0
L
FW 10
T
QW 88
L
FW 12
T
QW 90
BE
5
5-11
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