Omron CS1W-CRM21 - Page 186

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Sending Explicit Messages Section 6-4
(2) Similarly, when the data in the response format Service Data is returned
in word (2-byte) or double word (4-byte) units, it is specified in order from
the low byte to the high byte as the command format.
Example Using
CMND(490) to Send an
Explicit Message
Operation • Here, the header code (OMRON header code: 002F hex) is read from the
Slave Unit.
• Use SEND EXPLICIT MESSAGE (28 02) to read the data.
• The command data is written to D01000 onwards in the CPU Unit of the
PLC, and the response data is stored from D02000 onwards.
• If the command results in an error, the completion code is stored in
D00006 and the command is sent again.
Command Details
■ [ CMND S D C ]
Response
Explicit
message
CompoNet Master Unit
Unit number 0
PLC
Input Slave Unit
Node address: 11
Using
CMND(490)
Unit address: 20 hex
S D01000 +0 : 2802 hex Command code
+1 : 100B hex Input Slave node address: 11
+2 : 000E hex Service code 0E hex
+3 : 0001 hex Class ID 0001 hex
+4 : 0001 hex Instance ID 0001 hex
+5 : 0100 hex Attribute ID 01 hex
D D02000 : First response word
C D00000 +0 : 000B hex Number of command data bytes: 11
+1 : 000C hex Number of response bytes: 12
+2 : 0000 hex Remote (destination) network address: 0
+3 : 0020 hex Remote (destination) node address: 0
Remote (destination unit address): 20 hex
+4 : 0000 hex Response: required; Communications port No.: 0;
Number of retries: 0 hex
+5 : 0064 hex Response monitoring time
D02000 +0 : 2802 hex
+1 : 0000 hex
+2 : 0004 hex
+3 : 100B hex Response source node address: 11 (0B hex)
+4 : 008E hex Normal completion: 8E hex
+5 : 2F00 hex The vendor code is stored in order from the upper
byte to the lower byte.