GE GFK0579B user manual Computer, Tables

7

Monitoring/Controlling I/O Data:

Computer

To utilize the Remote I/O Scanner's I/O data correctly, a computer must know the sequence of modules in the rack, and the amount of input and output data each has.

For the PCIM, QBIM, and other GENI±based interfaces, the input and output data will occupy the Device Input and Output Tables at the segments associated with the Device Number of the Remote I/O Scanner.

I/O Tables

Input Table

32 segments, 128 bytes each

Output Table

32 segments, 128 bytes each

The Remote I/O Scanner automatically sends all discrete inputs followed by all analog inputs from the remote drop, each bus scan. The PCIM or QBIM places this data into its Input Segment. The application program must read the Input Segment to obtain the input data from the PCIM or QBIM.

Input Table Segment for a

Remote Drop

Discrete Inputs Bits

(number of bytes = configured

%I length / 8)

Analog Input Words

(number of bytes = configured

%AI length X 2)

The Output Segment is used similarly. The application program must send to the PCIM or QBIM's Output Segment all the discrete outputs followed by all the analog outputs for the remote drop. The PCIM or QBIM will automatically direct the outputs to the Remote I/O Scanner each bus scan.

112 Series 90±70 Remote I/O Scanner User's Manual ± July 1992