2. Programming Concepts
When PLC LINK is enabled, D1432 starts to store the times of polling. When D1431 =
D1432, PLC LINK stops and M1352 is reset. When M1352 is set ON again, PLC will start
the polling according to times set in D1431 automatically.
c) Note:
Auto mode M1351 and manual mode M1352 cannot be enabled at the same time. If
M1351 is enabled after M1352 is ON, PLC LINK will stop and M1350 will be reset.
Communication timeout setting can be modified by D1129 with available range 200
≦D1129 ≦ 3000. PLC will take the upper / lower bound value as the set value if the
specified value is out of the available range. D1129 has to be set up before M1350 =
ON.
PLC LINK function is only valid when baud rate is higher than 1200 bps. When baud
rate is less than 9600 bps, please set communication time-out to more than 1 second.
The communication is invalid when data length to be accessed is set to 0.
Access on 32-bit high speed counters (C200~C255) is not supported.
Available range for D1399: 1 ~ 230. PLC will take the upper / lower bound value as the
set value if the specified value exceeds the availanle range.
D1399 has to be set up before enabling PLC LINK. Setting up this register during PLC
LINK execution will not take effect.
Advantage of using D1399 (Designating the ID of starting Slave):
In old version PLC LINK, PLC detects connection from ID1 to ID16. Therefore, when
PLC LINK is applied in multi-layer networks, e.g. 3 layers of networks, the Connection
ID of 2
nd
and 3
rd
layer will be repeated. When Connection ID is repeated, i.e. the same
as Master ID, the connections will be passed. In this case, only 15 connections can be
connected in 3
rd
layer. To solve this problem, D1399 can be applied for increasing the
connectable connecitons in multi-layer network structure.
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