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6-15

6 Message Communications

CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)

6-3 Acyclic Messages

6-3-2 PROFIBUS MESSAGE SEND (2809)

The PROFIBUS DP-V1 MSAC1_Read service allows a PROFIBUS DP-V1 Master Unit to read (param-

eter) data acyclically from a PROFIBUS DP-V1 slave device, which is allocated to that Master unit.

The figures below show the command and response message formats.

 Command Format

 Response Format

Upon normal completion of the MSAC1_Read command service two types of response frames can

be returned:

• A normal data response frame containing the requested data.

• A normal response frame containing PROFIBUS error codes, indicating that the PROFIBUS

service was not completed correctly, although the message was completed normally.

Both response frames are shown below.

 Parameters

Destination address (Command, Response)

The address of the device on the PROFIBUS network, to which the PROFIBUS message will be

sent. The valid address range is 0 to 7E (Hex). The most significant byte in the Response Format is

set to 00.

Device Service Access Point (Command)

The Device Service Access Point for the MSAC1_Read PROFIBUS service must be set to 33 (Hex).

MSAC1_Read Service

Device

address

Command

code

28 09

Device Service

Access Point

Function

code

00 5E33

Data length

(bytes)

Slot

number

Index number

Command

code

28 09

Function

code

00 5E

Actual data

length read

(bytes)

Response

code

Data

Command

code

28 09

Function

code

00 DE

Response

code

Error

decode

Error

code 1

Error

code 2

Brand	Omron
Model	CJ Series
Category	Controller
Language	English

Omron CJ Series User Manual

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