Parker Hannifin S.p.A. - S.B.C. Division HPD N User’s Manual
72
Example 10: Inter-Drive Communication
IDC (Inter Drive Communication) refers to a specific configuration of the serial port of the
HPD drive that makes it possible to interchange parameters between two or more units.
With IDC enabled (Pr26=10) if bit b99.5 is set to 1 the HPD activates a broadcast
command by sending the value of Pr81 to the address of Pr80. HPDs that receive broadcast
commands with Pr26=10 automatically set b99.5 to 1 causing automatic transmission of Pr81
to the address of Pr80 in broadcast mode. Using this potential, it is extremely simple to
connect two HPD drives in a loop via the serial ports, and a short program on the internal
PLC will suffice to start transmission at power-on and restore it in the event of
communication errors. The following example describes the PLC program required to copy
Pr81 from the two drives in parameters Pr80.
Connection function
These PLC instructions must be entered on only one of the drives; both drives must have
parameter Pr26=10 to enable the IDC function.
drive 1 drive 2
Pr81 Pr80
Pr80 Pr81
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
X5 X5
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