Receiving Explicit Messages; Overview; Ne1A-Series Controller I/O Area Read - Omron NE1A-SCPU01 - 07-2009 Operation Manual

Receiving Explicit Messages

6-1 Receiving Explicit Messages
6-1-1

Overview

6-1-2

NE1A-series Controller I/O Area Read

Command Format
Response Format
108
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.
Reads the NE1A-series Controller's local I/O or the Safety Slave I/O area allo-
cated to the Controller from the master.
Lower Upper
Lower
byte byte
byte
Class ID
Instance ID
= 0306 (hex)
Service code = 4B (hex)
• Normal Response to Explicit Message
Byte Byte
0 1
Service code = CB (hex)
• Error Response to Explicit Message
Upper
Lower
byte
byte
Error code
Service code = 94 (hex)
Upper Lower Upper Lower
byte byte byte byte
Offset
Data size
address
Data
Byte Byte
n-2
n-1
Read data
Section 6-1
Upper
byte