Delta AH500 series, Hardware Operation Manual

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C h a p t e r 11 C o n v e n i e n t F u n c t i o n s
11 - 2 5
11.1.3.2 Setting a PLC Link
1. The process of setting a PLC Link is described below.
Step 1: Setting the parameters related to a PLC Link
Set the special data registers and the special auxiliary relays which are described in section 11.1.3.1.
Step 2: Assigning slave station addresses manually/automatically
If SM1595 is ON, users can assign station addresses to all the slave stations.
If SM1595 is OFF, users can assign a station address to slave station 1 (SR1756), and the system can
assign the station addresses starting from the station address that users assign to slave station 1 to the
other slave stations.
Step 3: Connecting to the slave stations manually/automatically
If SM1585 is ON, users can decide whether to connect a slave station to the master station by setting the
PLC Link flag corresponding to the slave station. SM1392~SM1423 are PLC Link flags.
If SM1585 is OFF, the master station will connect to the slave stations to which station addresses are
assigned.
Step 4: Reading data and writing data synchronously/Reading data and writing data
asynchronously
Reading data and writing data synchronously: If SM1598 is ON, the master station will read data from a
slave station, and write data into the slave station simultaneously.
Reading data and writing data asynchronously: If SM1598 is OFF, the master station will not read data
from a slave station, and write data into the slave station simultaneously.
Step 5: PLC Link in the manual/automatic mode
PLC Link in the manual mode: Before users set SM1587 to ON, they have to set the number of times the
master station exchanges data with all the slave stations (SR1338). The number of times the master
station exchanges data with all the slave stations is displayed in SR1337. If the value in SR1338 is 0,
SM1592 will be ON. The value in SR1338 can not be 0.
Users have to set SM1587 and SM1584 to ON first. If the value in SR1337 becomes the same as the value
in SR1338, the execution of the PLC Link will stop, and SM1584 will become OFF. If the users want to
execute the PLC Link in the manual mode again, they have to set SM1587 and SM1584 to ON again.
PLC Link in the automatic mode: After users set SM1586 and SM1584 to ON, the master station will
exchange data with all the slave stations. The PLC Link will be executed until MS1584 or SM1586
becomes OFF.
Step 6: Enabling the function of executing a PLC Link
After the setting of all the parameters is complete, users can set SM1584 to ON.