Bradley Smoker 16Communicating with a PLC-5 Adapter Channel, Locations of module 0 and 1 data

7-16Communicating with a PLC-5 Adapter Channel

Each group/module that is programmed as an adapter channel block transfer uses one byte in the adapter channel’s input destination file.

For example:

Scanner’s Output Image Table

Adapter Channel’s Input Destination File

Example Integer File

Word

d for status.

0

1

2

3

4

5

6

7

17 14 13 10 07 04 03 00

Output File

15 12 11 08 07 04 03 00

Input File

module 1 module 0

locations of module 0 and 1 data

A block transfer request for group 3, module 0 uses these bytes in the file. This byte is now unavailable for discrete data transfer.

Use care when planning block-transfer and discrete transfers of data to an adapter-mode controller channel.

ATTENTION

Use caution when performing data transfer. The discrete output data is over-written by the block transfer control on a group/module basis. If you write both types of transfer to the same group slot, unpredictable machine operation and possible damage to equipment or injury to personnel can occur.

Publication 1785-UM012D-EN-P - July 2005