Supplementary Notes; Keyboard Character Buffer; Multiprocessor Operation; Restarts - Siemens SIMATIC S5 Manual

I
When using the IP247 positioning module there are several characteristics of the SIMATIC S5
system which must be taken into account. The following sections deal with these characteristics.
7.3.1
The keyboards of the programmers have a buffer in which characters entered at the keyboard
are temporarily stored when characters are entered more quickly than they can be processed.
This can become apparent in the test display of COM247 when, for example, a fast sequence of
"forwards" and "reverse" commands is entered in the JOG mode. The execution then lags behind
the input. A stop command can only be executed when all the commands previously stored in
the character buffer have already been processed.
7.3.2
The S5-135U and S5-155U programmable controllers are designed for multiprocessor operation.
Several processors could access the same positioning module independently. This is not per-
mitted with the IP247 positioning module,
7.3.3
A reset pulse on the bus resets the I P247. A current job is then no longer active, just as if the
power had been switched off and on again.
The start-up characteristics of function blocks FBI 64 and FB165 are discussed in Part 6 "Stand-
ard Function Blocks FB164 and FBI 65". The IP247 positioning module reacts as follows when it
is restarted:
Following each restart of the module, the reference point is deleted and the "axis off" mode is ac-
tive. If the batttery back-up of the programmable controller was absent (the module was re-
moved), all the machine data and machining programs on the I P247 are lost, zero offsets and
tool length offsets are also deleted. If the module was backed up by the battery, the machine
data remain valid. The reference point coordinate is then signalled as the actual value.
Siemens AG°C790C0-B6576 -C707-01

Supplementary Notes

Keyboard Character Buffer

Note
immediately.
MultiprocessorO peration

Restarts

Supplementary Notes
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