24
BLuAC5 S/Q Hardware manual
920-0049 Rev. C
12/8/2014
Standard Digital Inputs
As we mentioned in the previous section, the high
speed STEP/PWM and DIR inputs are configured for
five volt logic. All other five digital inputs are designed
for operation between 12 and 24 volts DC. They are
single ended, optically isolated input circuits that can
be used with sourcing or sinking signals, 12 to 24
volts. This allows connection to PLCs, sensors, relays
and mechanical switches. Because the input circuits
are isolated, they require a source of power. If you are
connecting to a PLC, you should be able to get power
from the PLC power supply. If you are using relays or
mechanical switches, you will need a 12-24 V power
supply. This also applies if you are connecting the
inputs to the programmable outputs of another Si product from Applied Motion.
What is COM?
“Common” is an electronics term for an electrical connection to a common voltage. Some-
times “common” means the same thing as “ground”, but not always. In the case of the BLU
Servo, if you are using sourcing (PNP) input signals, then you will want to connect COM to
ground (power supply -). If you are using sinking (NPN) signals, then COM must connect to
power .
User Out 24V supply
The BLUAC5 has a 24 Volt 100ma isolated output
that can be used for powering Digital Inputs or out-
puts. This convenient power supply can be used in
place of an external supply.
Note: If current is flowing into or out of an input, the logic state of that input is low or closed.
If no current is flowing, or the input is not connected, the logic state is high or open.
The diagrams on the following pages show how to connect the inputs to various commonly
used devices.
2200
2200
2200
2200
2200
inside IN/OUT 1
XCOM
X3/SRVOEN
X4/ALMRST
X5
X7/CWLIM
X6/CCWLIM
8
7
6
5
3
4
Status
Regen
GND
+24VDC
Input
User Out
+24VDC
GND
