1. Introduction
RC700 / RC90 Option Fieldbus I/O Rev.14
9
Connection Types
There are two types of messaging connections: I/O messaging connection and Explicit
messaging connection. I/O messaging connection includes the two methods explained
below:
Change Of State : A device sends data whenever it changes. Signals for device diagnosis
are sent regularly in the background. This connection type is useful for
remedying EtherNet/IP communication traffic.
Cyclic
: A slave device transfers data regularly according to its internal timer.
This connection type is typically used for communicating with a
temperature Controller. The data transfer frequency is defined by
master configuration.
For Change of State and Cyclic, the ACK which verifies communication completion can
be disabled by setting. However, never disable the ACK since communication errors
cannot be detected.
1.4.3 General Specifications
EtherNet/IP Communication Specifications
Item
Specification
Supported
Connection
- I/O messaging connection
(Cyclic, Change of State)
- Explicit messaging connection
All connections are conformed to EtherNet/IP communication
protocol.
Baud Rates
100 Mbps, 10 Mbps
Maximum Nodes
128 (including master unit)
Data Length / Frame
244 bytes
Access Control Type
CSMA/CD
Cable
Universal Ethernet cable
NOTE
Summary of Contents for RC700
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