Mitsubishi Programmable Controllers FX-232ADP Manual de instrucciones descargar pdf (Pagina 61)

LESSON 7 - Addressing

Controlling and monitoring I/O in a PLC program requires knowledge of the address of

the point to be controlled. The same applies to Special Function Modules. This chapter

explains how the addresses of the modules and I/O point in a system are determine

Lesson Objectives: At the conclusion of this lesson, you will be able to…

9 Correctly address a discrete input or output point.

9 Determine the address of a Special Function Module.

9 Describe the I/O limitations of an FX3U system

Materials: FX-Series PLC Training Manual

7.1 Right Side Bus Rules of Addressing

1) Addressing of inputs and outputs is in Octal (X0-X7, X10-X17, etc.)

2) Addressing for both inputs and outputs start at 0 (X0 and Y0)

3) Addressing is consecutive

4) SFMs are addressed as Blocks 0 – 7. The first SFM encountered to the right

of the processor is block 0; the next one is block 1, etc.

5) A maximum of 8 SFMs can be connected to a main unit

6) SFMs do not affect the addressing of I/O modules, and vice versa.

7) FX3U PLC cannot have more than 128 inputs and 128 outputs directly

connected. It is possible to extend to 384 I/O via network modules.

8) SFMs use 8 points of I/O each. This is deducted off the 256 I/O max. Thus

an FX3U with one SFM has a maximum I/O capability of 248 I/O. The

Maximum number of inputs possible is still 128, and the maximum number of

outputs is still 128, as long as 248 combined I/O is not exceeded.

7.2 FX3U Left Side Adapter Bus Rules of Addressing

The FX3U series adds a new adapter bus on the left side of the PLC. This bus

has certain special adapter modules (ADP modules) which can be used to add

functionality to the PLC.

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Mitsubishi Programmable Controllers FX-232ADP Manual de instrucciones Pagina 61