Yokogawa Standalone MW100 - Manual (Page 3)

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IM CA150E
Introduction
There is a large install base of industrial automation Programmable Logic Controllers (PLCs) and remote I/O that support Eth-
ernet/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: PLC 2 ® , PLC 5 ® , SLC 500 ® , MicroLogix ® , CompactLogix ® and ControlLogix ® .
Yokogawa’s DAQMaster ® MW100 is a multi-protocol data acquisition, recording and reporting device that now has optional sup-
port for communications to EIP devices. It is now possible for the MW100 to record data directly from EIP device inputs and regis-
ters 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 Program-
mable Controller Communication Commands (PCCC) also known as DF1 communications via serial ports, an inexpensive gate-
way 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.
For example purposes RSLogix 5000 ® , RSLogix 500 ® , CompactLogix ® and SLC 504 ® are used as examples of EIP confi gura-
tion software and hardware; however, any EIP software and hardware should work in a similar manner as long as they support
Explicit and I/O (Implicit) messaging.