Read Command - Omron E3X-DRT21 Operation Manual

Explicit Message Communications
2-6-2

READ Command

Command Block
Response Block
List of READ
Commands
4. Set the response monitoring time to 6,000 ms minimum using the
CMND(490) instruction to send an explicit message.
Using C200HW-DRM21 or CVM1-DRM21
Set the response monitoring time to 6,000 ms using the IOWR(223) instruc-
tion to send an explicit message. (The message monitoring timer does not
need to be set with the DeviceNet Configurator.)
The READ command is used to read data from the Fiber Amplifier Sensor
Communication Unit or the Sensors connected to it. When an OMRON mas-
ter is used, the formats of the command and response blocks are as follows:
Destination
Service
node
Code
address
0E fixed
1 byte 1 byte
Normal Format
No. of received bytes
0004 (See note.)
2 bytes
Note The bytes of read data for Batch Read Incident Light Levels and Batch Read
Threshold Settings is twice the number of Sensors being read. The number of
received bytes is two plus twice the number of Sensors being read.
Error Format
No. of received bytes
0004
2 bytes
The following table lists the explicit message READ commands.
Explicit message
Read ON/OFF Data
Read Status
Read Incident Light
Level
Batch Read Incident
Light Levels
Instance ID
Class ID
2 bytes
Destination
node
Service Code
address
8E fixed
2 bytes (See note.)
1 byte 1 byte
Destination
node
address
Service Code
94 fixed
1 byte 1 byte
Function
Reads the ON/OFF status of
connected Sensors
Reads the status of the
Fiber Amplifier Sensor Com-
munication Unit
Specifies the unit number as
the instance ID and reads
the incident light level.
Reads incident light levels of
connected Sensors in a
batch.
Section 2-6
Attribute ID
2 bytes 1 byte
Read data
Error Code
2 bytes
Command
Class Instance
ID ID
009C 0000
009C 0000
009C Unit
number
009C 0000
Attribute
ID
01
02
03
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