Siemens SIMATIC S5 Manual page 45

Addressing and Programming IP 267
The module is in a "non-configured" state after power failure since all data in the
IP is deleted. The first message frame sent by the programmable controller to the
IP 267 is interpreted as the configuration message if both operating mode bits
signify "STOP" status and if the start/stop rate is not zero. Otherwise the data set
is not accepted and the module remains in the "non-configured" state. Valid
configuration data can be deleted if the "STOP" mode is sent to the IP in
conjunction with the velocity setting zero. In this case, the "Module configured"
LED (RDY) goes out.
"Start forwards" mode
The IP 267 can only execute a "Start forwards" job if it is in the "Standstill" state
and has previously executed one of the other operating modes ("Start back-
wards", "STOP" or "Neutral"); otherwise the module ignores the job. In the case
of "Start forwards", the IP 267 sets the RP (direction level) output to logic "1" and
the RP N (inverted direction level) output to logic "0".
_
"Start backwards" mode
In the case of jobs with the "Start backwards" mode, the levels at outputs RP and
RP N are exchanged (RP = "0", RP N = "1").
_ _
The IP 267 does not accept "Start forwards" or "Start backwards" positioning
jobs with the path set to 0.
"Neutral" mode (preparation for a new job)
The process output image PIQ is output to the modules connected each time the
programmable controller program is scanned. A positioning job can therefore be
sent to the IP 267 on several occasions but the IP only executes the first job. The IP
will only execute a subsequent job if it receives a different operating mode to the
previous one.
If you allocate two traversing jobs with the same direction, you must remove the
disable after the start of the first job by transferring "Neutral" mode to the
module. However, you should first scan the status message "Job executing" (IJE)
to determine that the first job has been executed. If IJE = 0, you can start a new
job in the same direction. Subsequent jobs with a different direction to the
previous job can be started without first activating the "STOP" or "Neutral"
modes ( 6.2.1).
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EWA 4NEB 812 6061-02a