Drive-to-drive link 349
Drive-to-drive link
What this chapter contains
The chapter describes the communication on the drive-to-drive link.
General
The drive-to-drive link is a daisy-chained RS-485 transmission line, constructed by
connecting the XD2D terminal blocks of the JCU control units of several drives. It is
also possible to use an FMBA Modbus adapter module installed into an option slot on
the JCU. The firmware supports up to 63 nodes on the link.
The link has one master drive; the rest of the drives are followers. By default, the
master broadcasts control commands as well as speed and torque references for all
followers. The master can send 8 messages per millisecond at 100/150-microsecond
intervals. Sending one message takes approximately 15 microseconds, which results
in a theoretical link capacity of roughly 6 messages per 100 microseconds.
Multicasting the control data and reference 1 to a pre-defined group of drives is
possible, as is chained multicast messaging. Reference 2 is always broadcast by the
master to all followers. See parameters 57.11…57.14.
Note: The drive-to-drive link can be used only if the embedded fieldbus interface is
disabled (see parameter 58.01 Protocol ena sel).
îš„ Wiring
See the Hardware Manual of the drive.
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