Supported Emulated Block Transfer Commands (Scattered Parameter Value Read) F-11
Message Operation
Scattered Parameter Value Read reads a pre-defined group of
parameter values, in any order, from the device. You define the
number of parameters to read in word 2 of the request. The
parameters to be read and their order is defined starting with word 3.
An unused word is left between each parameter request, so the drive
can respond with the parameter value, as shown.
If an error has occurred in reading any of the parameters:
• Word 1 of the drive response returns a value of –32765.
• Bit 15 of the drive response word for the number of that
parameter is set.
• The drive response word for the value of that parameter returns a
status word instead of returning the parameter value.
Example
In this example, eight parameters were read from a 1336 PLUS drive,
as defined in word 2 of the request. Parameter numbers 5, 7, 8, 20, 18,
17, 19, and 36 were requested. The drive response returned the values
of these parameters in the data file. These values are in drive units.
Data File Format
* Example only — These values vary depending on parameters and products.
0123456789
PLC request 19 3 8* 5* 0 7* 0 8* 0 20*
0 18* 0* 17* 0 19* 0 36* 0
Drive response 19 3 8* 5* 6* 7* 1000* 8* 1000* 20*
4096* 18* 4096* 17* 51* 19* 60* 36* 6144*
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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