Fisher IM Supplement: Getting Started with Modbus and OPC Systems-Fisher 4320 Wireless Position Monitor Manuals & Guides

Instruction Manual Supplement

D103640X012

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4320 Wireless Position Monitor

January 2018

Getting Started with Modbusr and OPC Systems

Fisher™ 4320 Wireless Position Monitor

Modbus Mapping of Set Point and Discrete Switch States Using Coils

When the DISCRETE SET POINT is written as true, the set point is written as Open. When written as false,
the set point is written as Closed.

The Discrete Switch State feedbacks are read back as True/False for the State value shown.

Note: The set point must be 'Open' and the switch state must 'Opened'.

When the DISCRETE SET POINT is written as true, the set point is written as Closed. When written as false,
the set point is written as Open.

The Discrete Switch State feedbacks are read back as True/False for the State value shown.

Writing Set Point through Modbus Register or OPC

There are 4 valid values for the Set Point variable:

4 - Close 5 - Open 6 - Closed* 46 - Opened*

Writing one of the above values will cause the gateway to send the corresponding set point.

*Recommended values for set point so the switch state will equal the value for the set point when the valve has reached it's final position.

The Discrete Switch State will report the current switch position. It's enumeration values for control are:

6 - Closed 18 - Closing 52 - Partially Open
17 - Opening 46 - Opened 48 - Error

1. Supplement to Fisher 4320 Wireless Position Monitor Instruction Manual (D103621X012),
available from your Emerson sales office
This supplement also pertains to TopWorx
see instruction manual D103622X012

www.Fisher.com

or at www.Fisher.com.

™

4310 Wireless Position Monitors (Supported Status),

, available at www.Fisher.com.

4320 Wireless Position Monitor

January 2018

Instruction Manual Supplement

D103640X012

To complete the Closed Loop process, the 'Closed' and 'Opened' states should match the corresponding set point.

SCREEN SHOT IS REPRESENTATIVE OF MODBUS

Mapped Variable Examples

SCREEN SHOTS ARE REPRESENTATIVE OF MODBUS

Mapped Alert Examples

SCREEN SHOT IS REPRESENTATIVE OF MODBUS

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