Omron C200HW-CORT21, Руководство по эксплуатации

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Receiving a user defined CAN message
Section 4-6
47
transferred to the PLC.
Clearing the buffer After a reset or after power-on, the buffer is only cleared when a new IOWR
message with control code #0004 is successfully executed. This means that
the buffer is also cleared when the same IOWR message (with the same
identifier values) is indicated to the Unit.
Example The following example shows how an arbitrary CAN message is read. In this
example, the Machine number is set to ‘1’.
Assume that there is a 32-bit counter unit on the network that transmits its
actual count value every time the count changes. On average, the count
changes every 2 ms. The identifier of the message is 280h. Another node
transmits its 8-bit input value every 4 ms with identifier 282h. A third node
transmits its 16-bit clock value every 200
µ
s with identifier 281h.
The scan time of the PLC is fixed to 8 ms. The C200HW-CORT21 only wants
to receive the 32-bit counter value and the 8-bit input value. The Unit does
not want its receive buffer to be filled with the high frequent clock messages.
The received messages must be transferred to DM0600.
14.00
IOWR (-)
Indicate_Identifier #0004
DM0500
#1004
255.06 12.00
EQ_FLAG ERROR
PLC memory address Contents
DM0500 0280
DM0501 0282
DM0502 0001
DM0503 0600
DM0600 0006
DM0601 0280
DM0602 0004
DM0603 1004
DM0604 000F
DM0605 0000
DM0606 0000
DM0607 0280
DM0608 0004
DM0609 1003
DM0610 000F
DM0611 0000
DM0612 0000