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Bulletin No. VVDED397044US R12/00 Section 2—Modbus Plus Overview

December 2000 MSTR Block

MSTR Block Structure

Inputs

MSTR has two control points (see Figure 27 on page 41):

• Top node input — enables the instruction when top node input is ON.

• Middle node input — terminates the active operation when middle

node input is ON.

Outputs

MSTR can produce three possible outputs (see Figure 27):

• Top node output — echoes the state of the top node input (goes ON

while the instruction is active).

• Middle node output — echoes the state of the middle node input and

goes ON if the MSTR operation is terminated prior to completion.

• Bottom node output — goes ON when MSTR operation is completed

successfully.

Figure 27: MSTR Block Structure

Control

Block

Data

Area

MSTR

Length

Operation active

Operation terminated

unsuccessfully

Enables selected

MSTR operation

Terminates active

MSTR operation

Operation successful

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 59 60

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