Chapter 16 PLC Function Applications│CP2000
16-145
16-10 Internal communications main node control
The protocol has been developed in order to facilitate the use of 485 instead of CANopen in
certain application situations. The 485 protocol offers similar real-time characteristics as CANopen;
this protocol can only be used on the CP2000 and CT2000 devices. The maximum number of slave
devices is 8.
Internal communications have a master-slave structure. The initiation method is very simple:
Slave device:
Set Pr.09-31 = -1 to -8 in order to access 8 nodes, and set Pr.00-20 = 1 to define the control
source as 485 and access the reference sources that must be controlled, namely speed command
(Pr.00-21 = 2). This will complete slave device settings. (PLC functions do not need to be activated)
System:
Setting the master is even simpler; it is only necessary to set Pr.09-31 = -10, and enable the PLC.
Hardware wiring:
The master and slave stations are connected via the 485 serial port. The CP2000 provide two types
of 485 serial port interfaces, see the figure below: (please refer to Section 06 Control terminals
concerning detailed terminal connections)
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