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Programming

BC9000 and BC910040 Version: 4.0.0

Sample

400bytes of remanent data, of which 200bytes should be persistent

6.6.2 Diagnostics

It is possible to read the diagnostic data in the Bus Terminal Controller. This information is located in the

flags area.

Flag byte Meaning

%MB4092-4093 Bit 0 ADS communication watchdog

Bit 1 ModbusTCP communication watchdog

Bit 1…14 reserved

Bit 15 No connection to switch: The Link LED does not light up (the transfer of this

error information is disabled in delivery state. To enable it, set register 25

[}77] in table100 to 1

bin

%MB4094-4095 Bit 0 K-bus error

Bit 1 Configuration error

Bit 2 K-bus cycle time exceeded (see table 1, register 17)

Bit 3…15 reserved

6.6.3 Cycle Time Measuring

The flags area includes a time measurement with a resolution of one millisecond for each digit. The data

type is UDINT (unsigned double integer). This value can be overwritten by the program, in order to align with

a controller. The overflow occurs after approx. 48days.

Flag byte Meaning

%MB4088-4091 4bytes

Data type UDINT

0...4.22billionms / 0... approx. 48 days

Resolution 1ms / digit

6.7 Fieldbus process image

6.7.1 Fieldbus process image

16bytes input and output are assigned to the fieldbus by default in all the BCxxxx devices. These variables

are known as the PLC variables. They are located by default in the BCxxxx process image starting at

address 128. This address can be shifted. The setting can be made with the KS2000 configuration software,

or, for some BCs, can be changed by means of start-up parameters.

6.7.2 ModbusTCP Process Image

The ModbusTCP process image makes a fundamental distinction between digital and byte-oriented (word-

oriented) signals. This will be clarified by examples.

Beckhoff BC9100 User Manual

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