Central units with extensions

The 40 and 50 series. It’s possible to increase the number of inputs / outputs of the basic

central unit by adding up to 6 local extension units of either type, binary or analog (Figure 1-1).

2.2. Central units with CS 31 bus

The 50 and 90 series. It’s possible to increase the number of inputs / outputs of the basic

central unit by adding remote units. The central unit controlling the system is called the

MASTER central unit. The maximum bus length is 500 m without an amplifier and 2000 m with

3 amplifiers (1 NCB or NCBR unit enables bus amplification for 500 m).

The master central unit can manage up to 31 connection points called SLAVES, such as:

– A remote unit with extension possibilities: a maximum of 6 extension units comprising of a

maximum of 8 analog input channels and 8 analog output channels

– A simple remote unit (without extension) with analog or binary inputs / outputs

– A remote TCAD display

– An ABB NCSA-01 variable speed drive interface

– A high speed counter unit

– A central unit (50 series with extension possibilities, 90 series and the previous 30 series)

– Or any other device which disposes of a CS 31 communication (see Figure 1-2).