Replace Melsecnet Containing A Remote I/O Station With Melsecnet/H - Mitsubishi Electric Artisan MELSEC-Q Series Manual

General-purpose programmable controllers, large/small

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4.3 Replace MELSECNET containing a remote I/O station with MELSECNET/H

Solution and Benefit

• Although MELSECNET systems may be a combination of local and remote I/O stations, two

separate networks are necessary when upgrading to Q Series. However, if the existing system

contains only a few remote I/O stations, only one network is needed if remote I/O stations are

replaced with normal (local) stations without changing the cable layout or adding new wiring.

• Even when the remote I/O stations are replaced with the normal stations, it is not required to

modify the control (master) station's network related programs.

The following is an example of upgrading a MELSECNET(ΙΙ) system to MELSECNET/H by replacing both local

and remote I/O stations with normal stations.

● Instructions

(1) Replace the MELSECNET(ΙΙ) master station with the MELSECNET/H control station, and the

MELSECNET(ΙΙ) local and remote I/O stations with the MELSECNET/H normal stations to maintain a single

network configuration. (This is because the controller network and remote I/O network cannot reside on a

single network.)

(2) Add a simple transfer program between LX/LY (link side device) and X/Y (actual I/O device) for the normal

station replaced from the remote I/O station. With this program, the normal station receives LY sent from

the control station by X and transfers it to actual output address Y; the normal station transfers input X to LY

so that the control station can receive it as X.

• MELSECNET(ΙΙ): I/O signal transfer between master station and remote station

- Master station input (X) <- Remote station input (X)

- Master station output (Y) -> Remote station output (Y)

• MELSECNET/H: I/O signal transfer between control station and normal station

- Control station input (X) <- Normal station output (Y)

- Control station output (Y) -> Normal station input (X)

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