Selective Consumption - GE VersaMax PLC User Manual

Parameters
as a contiguous set of bytes. The total size of all combined elements can be up to 1400 bytes. For
consumed exchanges, %S memory types and override references are not allowed. Refer to the table in
Exchange Data the section,
Ranges Note: If the consumed exchange length does not match that of the produced exchange, PLC Faults
and Ethernet exception entries occur.
The list of data ranges to be received in an exchange specifies:
Offset
example:
10.0
88 GFK-1503E
For public disclosure
Data Types for Ethernet Global Data
Reference Low Point
0.0 %R
%I

6.5.1 Selective Consumption

Not all data ranges within a produced exchange need to be consumed by each PLC. For
example, a producer is producing an exchange consisting of a 4-byte floating point value,
followed by a 2-byte integer, followed by a 2- byte analog value. If the consuming PLC
wants to consume only the analog value and place it into %AI003, the consumer might be
configured as shown below.
Offset Reference
0 Ignore (bytes)
6 %AI
Note that the total length of the exchange must be the same in producer and consumer,
even if the consumer is ignoring bytes at the end of the message. Failure to configure any
ignored bytes in the consumed exchange will result in exchange exception log and fault
table entries, error status in the exchange status data, and no data being transferred for the
exchange.
Description
for valid memory types.
High Point Description
Conveyor1 in PLC1
100 104
Conveyor1 limit switch in PLC1
257 264
Low Point High Point
1
3
Description
6 Ignore float and integer
3
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