Omron C200HW-CORT21-V1, Operation Manual

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Receiving a user defined CAN message
Section 5-8
81
The figure below shows the IOWR message structure.
IOWR message structure word n Minimum identifier [hex] range: 0000h ~ 07FFh
word n+1
Maximum identifier [hex] range: 0000h ~ 07FFh
word n+2
Identifier mask [hex] range: 0000h ~ 07FFh
word n+3
PLC start address
Identifier filter
Word n to word n+2 tell the C200HW-CORT21-V1 which messages to
receive, based on the identifier of the message. Word n and word n+1
indicate an identifier range.
To further narrow down the number of identifiers within this range, word n+2
indicates which bits in word n (the minimum identifier) must be matched and
which are don’t cares.
bit value ‘0’ = don’t care
bit value ‘1’ = must match
The use of word n to word n+2 is explained with a few examples.
Example 1. Configuring C200HW-CORT21-V1 to receive one specific identifier, e.g.
0200h.
Set the minimum and maximum identifier to the same value and set
the identifier mask to any value, e.g. ‘all bits must match’:
word n = 0200, word n+1 = 0200, word n+2 = 07FF
2. Configuring C200HW-CORT21-V1 to receive a range of identifiers, e.g.
010Ah to 0114h.
Set the minimum and maximum identifier value to cover the range
and set the identifier mask to ‘all bits don’t care’:
word n = 010A, word n+1 = 0114, word n+2 = 0000
3. Configuring C200HW-CORT21-V1 to receive specific identifiers within a
range, e.g. receive all odd identifiers within the range 010Ah to 0114h.
Set the minimum identifier to the first odd identifier in the range, the
maximum identifier to the maximum value and the identifier mask to
match the first bit of the first (odd) identifier:
word n = 010B, word n+1 = 0114, word n+2 = 0001
Note The C200HW-CORT21-V1 ignores bits 11 to 15 of word n ~ word n+2 of the
IOWR message structure. Also, the Unit does not check the validity of word n
~ word n+2 e.g. when the identifier value of word n is greater than word n+1,
no messages will be received.
PLC start address Word n+3 in the IOWR message structure indicates the start address of the
PLC memory area where the received CAN messages must be transferred
during the I/O refresh. The table below shows the definition of the PLC start
address.
PLC start address
0000 ~ 5900 DM0000 ~ DM5900 (C200HE: 0000 ~ 4000)
A000 ~ A140 IR000 ~ IR140
Word n+3
A300 ~ A420 IR300 ~ IR420
Note
When an incorrect PLC start address is set, error code 0440 is added to the
error log and received messages are no longer transferred to the PLC.