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Introduction
Introduction
This user’s manual is applicable to the CW120 (three-phase three-wire
model) and CW121 (three-phase four-wire model) clamp-on power
meters (hereinafter referred to as CW120/121) whose firmware version is
Ver. 1.06 or later, and provides information necessary for using communication functions and creating communication programs.
● The CW120/121 clamp-on power meters use the following communication protocols:
1) CW120/121-dedicated communication protocol
2) Power monitor (PR201) communication protocol
3) MODBUS communication protocol
4) PC link communication protocol
The CW120/121 cannot communicate with a higher-level device that
does not use any of the communication protocols above.
You are required to have background knowledge on the higher-level
devices to be connected to in order to understand the communication
specifications, communication hardware, language used for creating
communication programs of higher-level devices, and so on.
Note:
* PR201: Yokogawa panel-mounted power monitor
* Higher-level devices: PCs, PLCs (sequencers), graphic panels, and
others.
● For details on the functions or how to operate the CW120/121, see the
IMCW120-E user’s manual, "CW120/121 Clamp-on Power Meters."
FD No. IM CW120C-E
3rd Edition: May 2007 (KP)
All Rights Reserved. Copyright © 2002. Yokogawa Meters & Instruments Corporation
IM CW120C-E
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