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The System

Mounting Hints

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Ten valuable mounting hints

Tip 1 - Power supply unit

On no account must AS Interface be earthed or 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 extension

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 not exceed 100 m
Do not connect any slaves or AS Interface network power supply unit between the master and the extender
Never confuse the + and - lines

Expansion with repeaters:

Up to two repeaters can be connected in series. This increases the cable length to maximum 300 m (i. e. 3 segments with maximum 100 m).
An AS Interface power supply unit must be connected at every repeater.
Under normal conditions, an extender must not be connected beyond a repeater.

Tip 3 - Slaves

Each slave address is to be used only one. Only use addresses 1 to 31 or 1A to 31B in A/ B technology (Specification 2.1). Please note: modules containing the chip SAP 4.0 can be re- addressed up to 15 times, thereafter they will retain the last address.

Tip 4 - Additional auxiliary power

The following applies if slaves are to be supplied with additional auxiliary power:

at 24 V DC, a PELV power supply unit should be used and, if possible, the black profiled auxiliary power cable.
at 230 V AC, if possible, the red profiled auxiliary power cable should be used.

Tip 5 - Routing of the cable

When laying the AS Interface cables, please note the following:

Always use the yellow profiled AS Interface cable where possible, brown for + and blue for -.
Even though 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 immunity

Connect all inductance, e. g. contactor and relay coils, valves, brakes, with suppresser diodes, variators or RC elements. If frequency inverters 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 output 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 - Installing 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 sufficient cross section (at least 4 mm²).