Idec High Performance Series Manuel d'utilisateur télécharger pdf (Page 573)

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4 Communication Status Confirmation

O/I Link Communication

External Device Setup Manual

When there are one or more slave units in the offline status, the total scanning time of the O/I Link will increase by 30 msec. Even

when 15 slave units are in offline status, the increase will remain at 30 msec.

After power is turned on, the master sends handshake commands to the registered slave units in the ascending sequence and launches

normal communication starting with the slave units that send back the response.

When 15 slave units are registered, and only the 15th slave actually exist, the master sends handshake commands sequentially starting

from the 1st slave unit until it recognizes the 15th slave unit. The whole sequence takes approximately 420 msec (30 msec x 14).

After the data transmission with the 15th slave unit is completed, the master registers the slave to LSD102 and performs normal com-

munications with Slave 15. During the communication, the master sends a handshake command to one slave unit in offline status per

one O/I Link scanning.

4.4 Slave changes status from Online to Offline in the O/I Link

When a slave does not respond during normal communication between the master and a slave, the master aborts the processing and

starts communicating with the next slave unit. During the next O/I Link cycle, the master will again send a command to the slave unit

with which the error occurred during the previous cycle. If the slave does not respond again, the slave will set to the offline state and

will be deleted from Slave online information register (LSD104 in the master).

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Idec High Performance Series Manuel d'utilisateur Page 573

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