July 2013 8.9 PLC inputs/outputs 1529
8.9.2 Analog inputs
±10 V DC analog inputs and inputs for connecting PT 100 thermistors are
available on the external PL via a PL module (see Chapter 3, Mounting and
Electrical Installation).
In HSCI systems, no PLC module is necessary to read the current
temperatures of the PT 100 thermistors or the values of analog inputs. The
respective analog value is copied by the PLC run-time system into the
corresponding PLC operand that was defined for this input in IOconfig. This
operand is a 16-bit input word IWx. The assignment entered in IOconfig is
saved in a *.DEF file of the PLC program.
Only voltages of up to ±10 V– are permissible at the analog inputs.
The change rate of the PT 100 inputs can be set in discrete steps of [0.666 K/
s] per attached module. The function can be activated or deactivated for each
PT 100 input. The value 12000 (120 °C) is set if a PT 100 gets disconnected or
is not connected.
Along with the change rate, there is also a filter that forms a mean value for
the PT 100 inputs. Similar filters are available for the ±10 V voltage inputs.
These and other settings are made in the IOconfig software tool for PCs,
which includes detailed help documentation about the available possibilities.
8.9.3 Analog outputs
±10 V DC analog outputs are available on the external PL via a PL module (see
Chapter 3, Mounting and Electrical Installation).
In HSCI systems, no PLC module is necessary to output analog voltages. The
respective analog value is assumed by the PLC run-time system from the
corresponding PLC operand that was defined for this output in IOconfig. This
operand is a 16-bit output word OWx. The assignment entered in IOconfig is
saved in a *.DEF file of the PLC program.
Each analog axis or spindle needs an analog output on a CMA-H. These
outputs are then not available to the PLC.
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