Siemens CP 243-2 Operations Instructions download pdf (Page 24)

Tip 5 – Routing of the cable

When laying the AS-Interface cable please note the following:

• Always use the yellow profiled AS-Interface cable where possible, brown

for “+” and blue for “-”.

• Even whilst communication along the AS-Interface cable offers a high

degree of EMC immunity, it should still be routed away from power cables,

even in the control cabinet!

• Every AS-Interface line requires its own cable. AS-Interface cables must

not be laid together with others in a bus cable.

• If individual cores are used (e.g. in the control cabinet), always lay parallel

core pairs. In standard stranded wires, lay individual cores together or twist

them.

Tip 6 – Ensuring EMC

Connect all inductance’s, e.g. contactor and relay coils, valves, brakes, with

suppresser diodes, varistors or RC elements. If frequency converters are

used, always use network filters, output filters, and shielded motor cables.

Tip 7 – Sensor and actuator power

Sensors and actuators must be supplied directly from the associated input

or out-put of the slave. The cables should be kept as short as possible and

away from energy cables, i.e. the slave modules should be as close as

possible to the sensors and actuators.

Tip 8 – Installation of frequency converters

• Always follow the assembly guidelines in the operating instructions.

• Connect the cable shield, e.g. between filter and frequency converter and

between the frequency converter and the motor, directly at both ends with

a large contact surface, and with a sufficient cross section (at least 4mm

• Connect all metal parts to system ground.

Tip 9 – System expansion 2.1

With masters to Specification 2.1 it is possible to operate A/B slaves and

analog slaves according to Definition 7.3/7.4 (only as standard slaves).

Tip 10 – Status/diagnostics

For speedy diagnostics, the status and diagnostics bits should be analysed

in the PLC.

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Siemens CP 243-2 Operations Instructions Page 24