Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 239)

9-6
IM 04L31A01-17E
9.4 External Loop Setting > Basic Setting
Explanation
External loop control refers to operating and monitoring of control loops of connecting
models in the same fashion as internal loops by connecting slave devices (controllers) to
the CX and using Modbus communications between the CX and the connecting models.
The external loop control function enables you to retrieve the setup information of the
connecting models and correct the setup information.
Note
To retrieve various setup information by executing “Auto reading” on the External loop setting
(Basic setting ) display, the serial interface and Modbus master settings must be ready. Set the
serial interface and the Modbus master function and save the settings by pressing the [End] soft
key on the basic setting menu. Then, return to the External loop setting (Basic setting) display
and execute “Auto reading.”
In the external loop control function, the connecting models are set as external loops.
The following basic settings must be entered.
Selecting the Loop Number
Select the external communication loop number from the following:
Ext1 to Ext16 (Ext1 to Ext4 on the CX1000)
Turning Off/On Communications
• On
The succeeding setup items appear, and Modbus communication is enabled with
the device connected to the selected loop number.
• Off
Modbus communication is disabled. The succeeding setup items do not appear.
Setting the Modbus Address
Select the Modbus address of the connecting model from the following range:
1 to 247
Selecting the Connecting Model
Select the connecting model to communicate with from the following. Since the
functions of the UT Series controller vary depending on the model, the succeeding
setup parameters vary.
UT320, UT321, UT350, UT351, UT420, UT450, UT520, UT550, UT750, and ETC
Selecting the Loop
If the connecting model supports 2 loops, select the loop to be used from the
following:
First and Second
Setting the Tag and Tag Comment
Set the tag and tag comment using up to 8 alphanumeric characters.