Introduction Of Common Bus Control Mode - Parker FL20-CA Series Product Manual

FL20-CA Series
parallel with power cable or tie up together.
Please note that for the same time in half-duplex connection, and only one inverter can have
communication with PC/PLC. Should two or more than two inverters upload data at the same
time, then bus competition will occur, which will not only lead to communication failure, but
higher current to make certain elements damage.
(3) Grounding and terminals
Terminal resistance of 120 will be adopted for terminal of RS485 network, to diminish the

reflection of signals. Terminal resistance shall not be used for intermediate network.
No direct grounding shall be allowed for any point of RS485 network. All the equipment in the
network shall be well grounded via their own grounding terminal. Please note that grounding
wires will not form closed loop in any case.
Master
A+
The distance
Terminal Terminal
should be less
resistor than 0.5M. resistor
B -
Slave 1 Slave 2 Slave 3 Slave 4
Please think over the drive capacity of PC/PLC and the distance between PC/PLC and inverter
when wiring. Add a repeaters if drive capacity is not enough.
Note: All installations and wirings must be conducted only when servo drive is power off.

6.3 Introduction of common bus control mode

FL20-CA series supports 7 servo modes, as defined in the object dictionary 6502h.
Index Name Supported servo modes Setting Display Data VAR
112