Siemens CP 243-2 Operations Instructions download pdf (Page 23)

Ten valuable tips on assembly

The following 10 tips should be followed to make sure nothing goes wrong during as-

sembly:

Tip 3 – Slaves

Each slave address must only be used once. Only use addresses 1 to 31 or

1A to 31B in A/B technology (Specification 2.1). Please note: All modules

that contain the SAP 4.1 chip can be readdressed any number of times.

Tip 1 – Power supply unit

On no account must AS-Interface be grounded! Never use a normal power

supply unit only AS-Interface power supply units (PELV) with integrated data

de- coupling and connect “ground (GND)” with system ground.

Tip 2 – Network extention

Without repeaters or extenders the AS-Interface cable must be no longer

than 100 m – including all feeders to the assembly terminals! If you want to

expand the network please note the following:

Expansion with extenders:

• The maximum cable length between the extender and the master must be

no longer than 100 m

• Do not connect any slaves or AS-Interface network power supply unit

between the master and the extender.

• Lines “+” and “-” must not be swapped round.

Extension with repeaters:

• Up to two repeaters must be connected in series - that makes the cable

length in a feeder no more than 300 m (i.e. 3 segments with up to 100 m).

• An AS-Interface power supply unit must be connected at every repeater.

• An extender must not be connected beyond a repeater

Tip 4 – Additional auxillary power

If slaves are to be given an additional auxiliary power supply

• A PELV power supply unit and, if necessary, the black profiled auxiliary

power cable should be used.

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Siemens CP 243-2 Operations Instructions Page 23