4 Connections and wiring
4.1 Power supply
WARNING!
Danger of personal injury due to electric shock!
● Supply the device exclusively from power sources that have an extra low
voltage (e.g. SELV or PELV according to EN 61131-2)
● Connect only voltages and power circuits to connections, terminals and
interfaces up to 50 V rated voltage that have a secure disconnect for haz-
ardous voltages (e.g. with sufficient isolation).
CAUTION!
Fire hazard during module failure!
● Provide suitable fuses for the 24 V DC power supply for the final application.
Only fuses with a maximum nominal disconnecting current of 10 A may be
used.
4.1.1 Module supply
The module is supplied by the CPU via the K-Bus. The max. permitted fuse is
10A. (recommended fuse protection: circuit line breaker LSS 10A – type B).
4.1.2 Supply for connected transducers
CAUTION!
No galvanic isolation!
Voltage reversal leads to a short circuit between GND and 24 V.
The MM 240/A provides a 24 V and 5 V supply voltage for the connected in-
cremental encoders.
Power supply is via the 24 V terminal at the front. The 24 V are looped through
secured. In addition, 5 V are generated internally from the 24 V. The 5 V trans-
ducer supply can carry loads of up to 100 mA each.
4.2 Latch inputs
The latch inputs can be operated in 2 operating modes:
● as SINK input,
● as SOURCE input.
The configuration is carried out by software.
MM 240/A
Connections and wiring
© KEBA 2010
Project engineering manual V1.08 13
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