Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 144)

2 Functions of Devices in DVP-PLC
DVP-PLC Application Manual
2-116
e) Set up the start communication address of the Slave to be read/written. (See the explanations above on
special D). The default start communication address of Slave to be read: H1064 = D100. The default start
communication address of Slave to be written: H10C8 = D200.
f) Operation procedure:
i) Enable the function of more than 32 stations connected to EASY EASY PLC LINK and reading/writing of
16 data (Max. 100 data) (M1353).
ii) Enable reading/writing of EASY EASY PLC LINK in the same polling (M1354).
iii) Set up EASY EASY PLC LINK as auto mode (M1351), or manual mode (M1352) and the times of polling
(D1431).
iv) Enable EASY EASY PLC LINK (M1350).
9. How does Master PLC work:
a) To detect station No. of Slave: Set up the LINK to be automatic mode (M1351 = On) or manual mode
(M1352 = On) (Note: M1351 and M1352 cannot be “On” at the same time) When M1350 = On, Master PLC
starts to detect the total number of Slave stations connected to the LINK and records the number in D1433.
The detection time may differ upon the number of Slave stations and the setting of communication timeout
in D1129.
b) When M1360 ~ M1375, M1440 ~ M1455 = On, Slave ID1 ~ ID32 exist.
c) If the detected number Slave stations is 0, M1350 will be “Off” and the LINK will be stopped.
d) M1353 and M1354 should be set before EASY EASY PLC LINK is enabled. When EASY EASY PLC LINK is
executed, the two special M will not afftec the action of EASY EASY PLC LINK.
e) When 1353 = On, D1480 ~ D1607 (read/write buffer of SLAVE ID1 ~ 4) will be used for storing the No. of
registers D for Slave ID1 ~ ID32, The No. of register D shall not be “> 9,900” or “< 0” ; otherwise, PLC will
auto-set it as 9,900. The data length shall not be “ > 100” or “<0”; otherwise, PLC will auto-set it as 100.
f) When M1354 = On, set up Modbus Function H17 (synchronous read/write) for EASY EASY PLC LINK
communication. If the number of written data is set to be “0”, the communication of EASY EASY PLC LINK
will be automatically converted into Modbus Function H03 (read multiple words). Similarly, if the number of
read data is set to be “0”, the communication of EASY EASY PLC LINK will be converted into Modbus
Function H06 (write 1 word) or Modbus Function H10 (write multiple words).
g) If the number of read/written data > 16, the time for timeout (D1129) shall be > 500ms in case
communication timeout may occur.
h) After M1350 = On, Master PLC detects the ID of Slave E PLC only right after the LINK is enabled and will
not detect the ID again afterward.
i) After the detection on Slave PLCs is completed, Master PLC starts to read and write data from/into every
Slave PLC. Please be noted that, Master PLC only reads/writes data from/into the detected Slave PLC.
Master PLC will not read/write from/into the new Slave PLC to the LINK, unless it re-detects the ID of Slave
PLCs.
j) Master PLC conducts reading before writing. The ranges of Slave PLCs to be read/written will follow the
setting.
k) Master PLC will move to the reading/writing of the next Slave PLC after finishing reading/writing the current
Slave PLC.