YOKOGAWA F3LC11-1F, Руководство пользователя

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A1-3
IM 34M6H41-02E 2nd Edition : Aug. 1, 2005-00
A1.2 What can the Module Do?
n
Personal Computer Link Function
The Personal Computer Link module is used to connect to high-level equipment such as
displays, personal computers, DUONUS
*1
, DCS
*2
, etc. When a FA-M3 PC link
command is transmitted from the high-level equipment, the Personal Computer Link
module returns a reply (response).
*1: Compact Field Server from Yokogawa Electric Corporation. It enables real-time monitoring of field data of the FA-M3
from a WWW browser or in an Internet environment, using the Webmetry field monitoring package.
*2 : Distributed Control System from Yokogawa Electric Corporation.
Command
"What's the
value of
D00001?"
Response
"It's $12EF."
FA10201.VSD
Higher-level
equipment
FA-M3
By exchanging commands and responses, all devices (D registers, I relays, current
values of timers/counters, etc.) of the FA-M3 CPU module can be read and written.
Moreover, personal computer link also enables uploading and downloading of ladder
programs, reading and setting of date and time, reading of error logs and alarms,
reading of user logs, etc. (For details, refer to the list of commands).
This communications is transparent to user programs on the FA-M3. (That is, no
communications program is required on the FA-M3).
CAUTION
PC link commands are issued according to the timing of the high-level equipment. To
transmit data to the high-level equipment according to the timing of the FA-M3, you can
either poll for data continuously from the high-level equipment, or alternatively, you can
write a program that uses the “Event Transmission Function” described later in this
subsection to transmit an event to the high-level equipment from the FA-M3, and have
the high-level equipment read the data once it receives this event.