Yokogawa Standalone MW100 - Manual (Page 95)

3-1
IM MW100-17E
EtherNet/IP
1
2
3
App App
Index
3.1 Introduction
There is a large installed base of industrial automation Programmable Logic Controllers
(PLCs) and remote I/O that support EtherNet/IP (EIP) also known as Control and
Information Protocol (CIP) over Ethernet. Most notable is the family of PLCs and I/O
manufactured by Allen-Bradley (AB) consisting of such controllers: PLC 2, PLC 5, SLC
500, MicroLogix, CompactLogix, and ControlLogix. Yokogawa’s MW100 DAQMASTER
is a multi-protocol data acquisition, recording, and reporting device that supports
communications to EIP devices. It is now possible for the MW100 to record data directly
from EIP device inputs and registers over an Ethernet network. The MW100 may also act
as remote I/O for EIP PLCs and Human Machine Interfaces (HMIs).
When using EIP, the MW100 is a passive device on the Ethernet network in that it
does not initiate read or write requests. In most cases the MW100 will be working in
conjunction with a PLC or controller. Read and write requests via EIP are initiated
through program logic in controllers via Explicit Messaging and I/O Messaging (also
known as Implicit Messaging). With the controller managing communications, it is
possible to integrate messaging such that communications only occurs when dictated by
the control logic. Management of communications by the controller allows the controller
to decide when it is appropriate to write a value to the MW100 (e.g. when a computation
is complete).
The MW100 also supports older controllers where EIP was not a standard option. For
older controllers that support Programmable Controller Communication Commands
(PCCC) also known as DF1 communications via serial ports, an inexpensive gateway
can be used to convert communications to EIP. For controllers that support PCCC
encapsulated via Ethernet, the MW100 supports EIP with embedded PCCC read and
write requests. A step by step example of gateway configuration is detailed in appendix 9.
For example purposes RSLogix 5000, RSLogix 500, CompactLogix, and SLC 504 are
used as examples of EIP configuration software and hardware – but any EIP software
and hardware should work in a similar manner as long as they support Explicit and I/O
(Implicit) messaging.
Chapter 3 EtherNet/IP