Page 19
06-Mar-1997
VME4ST Backplane technical manual
Doc. VLT-MAN-ESO-17130-0992
4.1.9 /HOME1 to /HOME4
Reference position (home) signal 1-4. This signal is used for initialising motor position in
some applications. For detailed description of how to use these signals, see MAC4 manual.
Signals are routed from function connectors CH1-CH4 to MAC4 motion controller via opto-
couplers on the backplane. If the /HOME pin is left unconnected in the function connector
(CH1-CH4) the MAC4 reads ON reference position. A grounded input will be interpreted as
OFF reference position.
MAC4-STP
VME4ST
VME4ST P2 BACKPLANE
MOTOR
CONNECTOR
(ONE AXIS)
VME
BUS
OPTO-
COUPLER
/RS
G
N
D
OPTO-
COUPLER
V
C
C
FUSE 1.5A
HOME
+5V
+5V
USER
REFERENCE
SWITCH
(EXTERNAL)
+5V
GNDA
Fig 4.1.9. Reference switch (/HOME) signal connection.
Note 1
:
Important !
Close the jumpers BR7, BR11, BR15, BR19 on MAC4-STP to adapt
the four /DF inputs, respectively, for TTL-level inputs. If the jumpers are not closed, the
inputs are configured for +24V level inputs, and will not work.
Note 2 :
When VME4ST servo amplifier is not seated in its slot, the reference position inputs
/HOME1 to /HOME4 of the MAC4 unit will all be low (ON reference position)
because the optocouplers are supplied from the VME4ST board.
Note 3 :
In MACCON documentation, this signal is referenced to as -RS1 to -RS4.
