Omron NE1A-SCPU01 - 07-2009 - Receiving Explicit Messages; Overview; NE1 A-Series Controller I;O Area Read

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Receiving Explicit Messages Section 6-1
6-1 Receiving Explicit Messages
6-1-1 Overview
Sending explicit messages from the Standard Master to the NE1A-series
Controller enables reading or writing any specified data or parameters of the
Controller. The Controller operates according to the command sent from the
master and returns a response. This function can be used with both
DeviceNet and EtherNet/IP.
The following example describes the I/O area read service provided by the
Controller. Refer to Appendix 3: Explicit Messages for details on the services
that are available.
The format shown here for explicit messages is the format used on the net-
work. Refer to the operation manual of the Standard Master for specific setting
methods for each Standard Master.
6-1-2 NE1A-series Controller I/O Area Read
Reads the NE1A-series Controller’s local I/O or the Safety Slave I/O area allo-
cated to the Controller from the master.
Command Format
Response Format
• Normal Response to Explicit Message
• Error Response to Explicit Message
Class ID
= 0306 (hex)
Instance ID
Data
Service code = 4B (hex)
Offset
address
Data size
Lower
byte
Upper
byte
Lower
byte
Upper
byte
Lower
byte
Upper
byte
Lower
byte
Upper
byte
Read data
Service code = CB
(
hex
)
Byte
0
Byte
1
Byte
n-2
Byte
n-1
Error code
Service code = 94 (hex)
Lower
byte
Upper
byte