Customer Keys - Siemens MPP 464 IE H Equipment Manual

Connecting

6.3 Customer keys

Individual wiring connection
The individual contacts are connected according to the necessary customer-specific links, see
chapter "Customer keys".
Note
Supply voltages for inputs and outputs must always be grounded!
6.3 Customer keys
The customer keys (KT) module connects the operator panel and the COM board.
The inputs for handheld unit connection and extension keys are opto-decoupled. The associated
outputs are provided via high-side drivers.
The floating individual contacts of function keys S1 ... S4 and S7 ... S10 are shown in the figure.
Figure 6-4 Individual wiring of customer keys (a, b, ..., m designate IN and OUT of the individual blocks)
NOTICE
Damage to pushbutton contacts
When using an external 24 V encoder supply, always protect the key contacts against overload
in the individual wiring with an external fuse for L+ with the following properties:
• Fuse according to UL248: 1.6 A.
If you use the encoder supply X20:A15/A16 or VS1/VS2 of the ET200S block 4/8 F DI 24 VDC
PROFIsafe, the external fuse can be omitted.
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Machine Pushbutton Panel: MPP 464 IE H
Equipment Manual, 03/2021, A5E50810237B AA