Plc Inputs/Outputs; Pl Assignment - HEIDENHAIN TNC 426 PB/M Technical Manual

6.17 PLC Inputs/Outputs

Switching inputs 24 Vdc
Switching outputs 24 Vdc
Analog inputs 10 Vdc
Inputs for Pt 100
thermistors
Analog outputs 10 Vdc
Control-is-ready output
Control-is-ready input
a. You need one analog output for each analog axis.

PL assignment

December 2001
The logic unit provides you with digital inputs/outputs and analog inputs/
outputs for the PLC. If the available number of I/O is not enough, you can add
up to four PL 4xxB (See "Mounting and Electrical Installation" on page 3 – 5).
Logic unit
X9 X41 X42
– – 56
– 31 –
– – –
– – –
a
13 ) – –
– 2 –
– – 2
To interrogate and set the inputs and outputs of the PLC I/O unit you need PLC
modules.
Up to four PL 4xxB PLC I/O units can be connected. The first PL is connected
to the LE, the second PL to the first PL, the third to the second, etc. The PLs
are permanently assigned to specific inputs and outputs. If a PL is dropped,
the assignment of the inputs and outputs to the PLs also changes. To avoid
having to change your PLC, you can assign a logical PL (no. of the PL according
to the assignment of I/O in the PLC program) to the physical PL (no. of the PL
as seen by the LE).
PLC Inputs/Outputs
PLC input/output unit
X48 PL 410B
– 64
– 31
3 (4)
3 (4)
– –
– 1
– –
PL 405B
32
15
–
–
–
1
–
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