Description
General setup rules：
An ABB AC 31 system always includes an AC 31 central unit. There are three types of central units:
- The 40 series central unit, with a local inputs / outputs extensions interface
- The 50 series central unit, with a local inputs / outputs extensions interface and a CS 31 bus interface
- The 90 series central unit, with a CS 31 bus interface
Each central unit incorporates a specific number of binary inputs / outputs and occasionally analog. It is possible, depending on the central unit, to increase the number of inputs / outputs, to add input / output extensions connected directly to the central units or remote input / output units via the CS 31 twisted pair.
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.
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.
Comment:
A slave fitted solely with binary channels occupies 1 connection point.
A slave fitted with binary and analog channels occupies 2 connection points of the available 31.
The maximum number of remote ANALOG units depends on the MASTER central unit:
50 series:
- a maximum of 31 remote analog input units
- a maximum of 31 remote analog output units
- a maximum of 15 extensible remote units (ICMK14F1) with analog input / output extensions + 1 remote analog input / output unit (15 x 2 + 1 = 31)
- or a mixed binary / analog configuration within the previous limits
90 series:
- a maximum of 12 remote analog input units
- a maximum of 12 remote analog output units
- or a maximum of 12 slaves with analog extensions
Functional
The 40 and 50 series central units memory is composed of two distinct areas:
- A SRAM memory where the user program and data is loaded.
- A Flash EPROM memory which contains:
- a backup of the user program with the program constants,
- the configuration data,
- and the system program protected against access from the user program.
An incorporated battery, which is available only in the 50 series, also enables the backup of internal variables.
The user program is a set of universal functions conceived by the constructor to cover all applications and ensure all the basic PLC functions. It is developed with the AC31GRAF software. After being translated into instructions understable by the central unit it is loaded in RUN or STOP mode into the SRAM and then saved from the SRAM to the Flash EPROM. Thereby, at each program launch the user program, saved in the Flash EPROM, is copied to the SRAM for processing by the microprocessor. The structure of the system program memory, the user program, the inputs / outputs and internal variables are described in the annex (mapping).
Stock part list:
ABB 07AI91 GJR5251600R0202
ABB 07DI92 GJR5252400R0101
ABB 07KT97 GJR5253000R0100
ABB 07KT97 GJR5253000R0200
ABB 07KT97 GJR5253000R0160
ABB 07KT97 GJR5253000R0270
ABB 07KT97 GJR5253000R0278
ABB 07KT97 GJR5253000R0280
ABB 07AC91 GJR5252300R0101
ABB 07DC92 GJR5252200R0101
ABB 07LE90 GJR5250700R0001
ABB 07KR91 GJR5250000R0101
ABB 07KR91 GJR5250000R0303
ABB 07AB61 GJV3074361R1
ABB 07BA60 GJV3074397R1
ABB 07BE60R1 GJV3074304R1
ABB 07BT62R1 GJV3074303R1
ABB 07BV60R1 GJV3074370R1
ABB 07EB61 GJV3074341R1
ABB 07MK92 GJR5253300R1161
ABB 07NG20 GJR5221900R2
ABB 07NG61 GJV3074311R1
ABB 07NG61R2 GJV3074311R2
ABB 07AC91 GJR5252300R3101
ABB 07AC91
07PR22 GJR2294700R1
07XS01 GJR2280700R3
07YS03 GJR2263800R3
07ZE23 GJR2292800R0202
07ZE61 GJV3074321R302
07ZE61(07PS60) GJV3074330R1
PROCONTIC CS31 ECZ
07AB61R1 GJV3074361R1
07EB61R1 GJV3074341R1
07KT93 GJR5251300R0101
07KT98 GJR5253100R0260
07KT93
07KT98 GJR5253100R0270
07KT98
07KT94
07KT94 GJR5252100R0101
07KT98 GJR5253100R3262
07KP93 GJR5253200R1161
07KT98 GJR5253100R0272
XO08R2
XK08F1 1SBP260104R1001
07CR41
07KT98 GJR5253100R3160
Post time: Jan-20-2026