Read coil

This operation reads the values from the coils of Modbus protocol-compatible equipment.

You can display the read coil operation screen by displaying the script canvas on the Designer screen, clicking the following items in the following order, and then dragging and dropping the component icon onto the script canvas:

  • Tool palette > Industrial equipment > Modbus > Read coil

 

Figure 5.1 Read coil operation screen

(1) Field list

This is a list of the fields to configure for the read coil operation.

Table 5.1 Field list

Field Name

Initial Value

Setting Value

Omission

Notes

Name

 

Single-byte alphanumeric characters and certain symbols (*1)

-

A value that begins with a single-byte alphabetic character

Required settings

 

Destination

 

 

-

 

Slave ID

01

From 01 to FF

-

Select hexadecimal

Starting address

 

From 0 to 65535

-

Set as integer

Number of data

 

From 1 to 999

-

 

Interval

1

From 0.01 to 1314000.0

-

Unit: seconds

Comment

 

Comment

 

Characters

✓

 

✓

:

Possible to omit

-

:

Impossible to omit

*1

:

Only "_" (underscore) can be specified.

(2) Description of each field

This section explains each of the fields to configure for the read coil operation.

After changing these settings, click Finish to save the settings.

Click Cancel to discard the changes.

Name

Name of the read coil operation component

Single-byte alphanumeric characters and "_" (underscore) can be used.

Use a value that begins with a single-byte alphabetic character.

Required settings

Destination

Modbus destination

Select the Modbus destination for the coil reading.

When you click Add, the Modbus TCP connection settings screen appears.

For details on the Modbus TCP connection settings screen, refer to Modbus TCP connection settings.

When you click Edit list..., the editing screen for the resource list appears.

For details on the editing screen for the resource list, refer to Edit resource list.

Slave ID

Slave ID

Select the slave ID for the coil reading.

Starting address

Starting address

Specify a numerical value from "0" through "65535" for the starting address for the coil reading.

Number of data

Number of data items

Specify a numerical value from "1" through "999" for the number of data items for the coil reading.

Interval

Interval to read coil (seconds)

Specify the interval at which to read coil as a numerical value from "0.01" through "1314000.0".

Comment

Comment

Comment regarding the read coil operation

You can enter a comment.