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
.
Note:
The drive-to-drive link can be used only if the embedded fieldbus interface is
disabled (see parameter
Wiring
See the
Hardware Manual
of the drive.
Summary of Contents for ACS850 series
Page 1: ...ACS850 Firmware Manual ACS850 Standard Control Program ...
Page 4: ......
Page 56: ...56 Control locations and operating modes ...
Page 262: ...262 Parameters ...
Page 310: ...310 Fault tracing ...
Page 348: ...348 Control through a fieldbus adapter ...
Page 358: ...358 Drive to drive link ...