PC Control / Profi Control 645-12M Instruction Manual pdf - Kuhnke

4.5.1.1. Short description of local operands
PC Control 645-12M used as PLC
Operands are all addresses that can be addressed by the
user program for signal processing or data storage. They
are "operated" with.
Inputs and outputs
You can connect no local inputs and outputs to PC Control
645-12M. You can, however, use these addresses as additional
markers.
Bit, byte, word markers
There are bit markers, byte markers (8 bit) and word markers
(16 bit) available for storing (marking) current data.
The contents (values) of remanent markers are not changed
by RESET or restart. All other markers are cleared at restart.
Timers
PC Control 645-12M has, as a standard, 128 software timers
(PT00.00-PT07.15). The time range is from 10 ms -
65535 s. These timers can be programmed with raising or
falling delay or as clock pulse or pulse generators respectively.
If required they can be remanent.
Counters
32 counters with a depth of 16 bit (0-65535) can be programmed
as up or down counters. They too can be
remanent if required.
DP-RAM markers
Address ranges SLG and SLH are used as process chart
memory for data exchange processes between PC and
PLC, e.g. for process visualisation. They are used in combination
with KUBES module PA_MOVE.
System error marker "ERR00.00"
Once system errors have been detected, they are written
into byte operand (8 bit) "ERR00.00" by the monitor program.
They can be read and analysed by the user program.
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