PLC Device

In ST program, you can use PLC Devices directly. Device can be used in the right/left side of the expression and factor of a function.

It is identical to PLC device but it includes a prefix between the device type and address which indicates bit and word.

Following is how to use PLC Device.

Format: DeviceType Prefix DeviceAddress

 

Prefix

Items

Description

None

1-bit device

X

1-bit device

W

Word (16-bit) device

 

 Example

Examples

Description

MX00 := 1

Substitute 1 to M00 (bit) (Turns ON the M00)

M01 := 1

Substitute 1 to M01 (bit) (Turns ON the M01)

DW100 := 100

Substitute 100 to D100

DW101 := 0x100

Substitute 0x100 (hexadecimal) to D101

 

X, Y, M, K, L, F -> None/X/W
T, C, S -> None/X
D-> X/W
Z, TC, TS, CC, CS -> W