Using The Comreq Function To Send Data Commands; Command Block - GE VersaMax Manual

13
IC200MDD841
Mixed Module, 24VDC Positive Logic Input 20 Points / Output 12 Point /
(4) High Speed Counter, PWM, or Pulse Train Configurable Points

Using the COMREQ Function to Send Data Commands

The VersaMax PLC CPU can use the COMREQ function to send Data Commands to the
High Speed Counter module. These commands are all 6 bytes in length. The command
data must be placed in the correct order (in a command block) in CPU memory before the
command is executed. Program logic should be set up to assure that the command is sent
to the module once, not repeatedly. This function is effective only on counters that are
enabled.

Command Block

The format for Data Commands is as follows:
The command block used to send Data Commands is composed of 10 words as shown
below. All values are hexadecimal unless otherwise indicated. Note that if the command
block is not set up correctly, unexpected operation may occur. The command block can be
placed in any word-oriented area of memory that is not reserved.
Location
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
%R0008
%R0009
%R0010
13-26 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
MSB
0n
command word
dd
data word (LSW)
data word (MSW)
dd
Data
0004 Should be 0004
0000 Reserved (must be zero)
nnnn Status Data type (0008 = R, 000A=AI, 000C=AQ, 0010=I, 0012=Q)
nnnn Start location of COMREQ Status word
0000 Reserved (must be zero)
0000 Reserved (must be zero)
0003 HSC application request (always 3)
nnnn Command word
nnnn LS data word
nnnn MS data word
LSB
cc
where: n=counter 1-4
cc=subcommand code
dd=data type
dd
dd
Description
GFK-1504K