Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 327)

App. - 33 App. - 33

MELSEC-Q

APPENDIX

(2) Program example for interlocking the remote master station and

remote I/O station

Interlocks should be applied to the programs according to the link status of the

remote master station (host station) and remote I/O station (other station).

The following example shows an interlock in the communication program that

uses the link status (SB47, SB49) of the remote master station and the link status

(SW70 bit 0, SW74 bit 0, SW78 bit 0) of the remote I/O station (Station No. 1).

Sample programs (Refer to Appendix 9.2 and later)

SB47: Baton pass status of host

SB49: Data link status of host

SW70: Baton pass status of other station

SW74: Data link status of other station

SW78: Parameter communication

status of other station

SB20: Network module status

Set the following values for the timer constant K .

Baton pass status

(T0, T2)

More than (sequence scan time

Cyclic transmission status

Parameter communication status

(T1, T3, T4)

More than (sequence scan time

Reason: This way the control is not stopped even if the network detects an

instantaneous error due to a faulty cable condition and noise

interference.

Also, the multipliers of 4 and 3 should only be considered as a

guideline.

(3) REMFR/REMTO instruction

Perform programming so that the next instruction is executed after the

REMFR/REMTO instruction is executed and then completed.

The completion of the REMFR/REMTO instruction can be confirmed by the

completion device.

POINT

(1) After the execution of the REMFR/REMTO instruction, several scans are

required before the read/write of the actual data is completed.

(2) For the interlock program for the remote master station and remote I/O station

of the MELSECNET/H and details of the REMFR/REMTO instruction, refer to

the "Q Corresponding MELSECNET/H Network System Reference Manual

(Remote I/O Network)".

1 2 ... 322 323 324 325 326 327 328 329 330 331 332 ... 357 358

Commentaires sur ces manuels

Pas de commentaire

Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 327

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Mitsubishi-electric QJ71C24N