System Description
daisy-chained from RS-232 OUT to RS-232 IN in this manner
*
. Note that
unique controller addresses must be set for network operation, but they do
not need to be in any particular order.
Fig. 7: C-862.CN Mercury™ Class network cable, length 28 cm, other lengths
available on request
Power (15 to 30 VDC, 15 V recommended) must be supplied at the power in
connector. Be sure never to connect a 24 V power supply to the older 12-
15 V, C-862 Mercury™ DC-motor controller.
CAUTION
!
The voltage output on the “Motor +” and “Motor -“ pins can be as high as the
supply voltage used. If using a non-standard power supply for the Mercury™
and a motor that connects to these lines (i.e. without separate PWM
amplifier), make sure the motor’s operating voltage will not be exceeded.
3.5
Limit Signals
During operation, limit sensors (switches) can be used to stop motion at the end of
the allowable travel range and/or to provide absolute position information
(referencing); see the commands manual for the command set you are using for
details of commands that use these signals. Each of the two switches will interrupt
motion in a particular direction. If positioning equipment from PI is used, the limit
switches or sensors are pre-wired for operation with Mercury™ controllers.
The Mercury™ controller can be configured to accept either an active-high or an
active-low stop signal from the limit sensors (both must be the same). As default
high signals are used to inhibit movement.
The limit switch signals are interpreted by both the controller hardware and
software. With DIP switch 7, the hardware interlock can be changed between
active-high (OFF) and active-low (ON). For the software configuration, see the
*
The RS-232 output circuitry of some PCs may not be capable of driving more than 6 Mercurys™; if
this is a problem use USB to interface with the PC.
www.pi.ws
C-863 MS173E Release 1.2.7
Page 21
