Omron CJ Series User Manual

6-7
6 Message Communications
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
6-3 Acyclic Messages
6
6-3-1 EXPLICIT MESSAGE SEND (2801)
6-3 Acyclic Messages
Acyclic message services allow exchange of extended information between a PROFIBUS DP-V1 Mas-
ter and a PROFIBUS DP-V1 slave device during regular I/O data exchange.
Sends an explicit message over the PROFIBUS network to an OMRON slave device (GRT1 SmartSlice
for example) and receives a response.
 Explanation
The Explicit Message Send command sends a CIP-defined explicit message to an OMRON PROFI-
BUS Slave device supporting CIP messages.
Note 1 For information on explicit messages for OMRON slave, refer to SmartSlice GRT1-Series
GRT1-PRT PROFIBUS Communication Unit Operation Manual (Cat No. W04E-EN-
□).
2 The Explicit Message Send command is wrapped in a PROFIBUS DP-V1 Class 2 mes-
sage. The handling of this message, i.e. establishing a connection, transferring data and
aborting a connection is done automatically by the PROFIBUS Master unit.
 Command Format
 Response Format
If a normal response has been returned by the targeted device, the response format for the exe-
cuted explicit message is as follows:
If transmission of the Explicit message was successful, but the execution was not, the response
message will still contain response code 0000 as well as return data. However, an error code, indi-
cating the failure will be part of the data block. The response format for this case is shown below.
6-3-1 EXPLICIT MESSAGE SEND (2801)
Command
code
28 01
Destination
station address
Service code
Class ID Instance ID Service data
996 bytes max.
Command
code
28 01
No. of bytes
received
Service data
996 bytes max.
Response
code
Source station
address
(
local node
)
Service code
00 00

Omron CJ Series Specifications

General

Brand	Omron
Model	CJ Series
Category	Controller
Language	English