December 2001 PLC Inputs/Outputs 6 – 387
6.17 PLC Inputs/Outputs
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).
To interrogate and set the inputs and outputs of the PLC I/O unit you need PLC
modules.
PL assignment 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).
Logic unit PLC input/output unit
X9 X41 X42 X48 PL 410B PL 405B
Switching inputs 24 Vdc ––56 – 64 32
Switching outputs 24 Vdc – 31 ––31 15
Analog inputs 10 Vdc –––3(4) –
Inputs for Pt 100
thermistors
–––3(4) –
Analog outputs 10 Vdc 13
a
) –––– –
Control-is-ready output – 2 ––11
Control-is-ready input ––2 –– –
a. You need one analog output for each analog axis.
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