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An open circuit and short circuit on the CS31 bus are

detected by the NCB. In this case, the different CS31 bus

segments below the default are out of order. The CS31

bus segment above the default runs properly.

The leds ERRORS "OUT" or "IN" are "ON" according on

the CS31 bus in default.

This error is displayed on the central unit (FK3) as a

remote unit error.

The access to the default is different according on the type

of central unit :

07KR31 / 07KT31

– access to the default with the function block COPY to the

memory address SEG : 0h and OFFSET : 8660h

If the value is 2Ah, then almost one of the NCB's is on

default. (The red led on central unit is OFF).

The default is reset on the central unit when 0 is written

at the address 0:8660h (with the function block COPY).

– access to the default as an FK3 error number 17d with

the versions produced after April 96 (07KR31 index J

and 07KT31 index B).

07KR91 / 07KT92 / 07KT93

– access to default with the function block COPY to the

memory address SEG : C000h and OFFSET:0100h

If the value is 2Ah, then almost one of the NCB's is on

default. (The red led on central unit is ON).

The default is reset on the central unit when 0 is written

at the address 0C00/0100h (with the function block

COPY).

07CS61 (for T200)

– Version index c R202

The default is seen as a bus error without any remote unit

number.

– Version index d R202 and next

The default is set in the bit 4 of the word MW4104,03 for

the first CS31 line, MW4105,11 for the second CS31 line,

MW4107,03 for the third CS31 line and MW4108,11 of the

fourth CS31 line.

07CS91 (for T300) and UCZA/UCZB

The diagnosis is not available.