Applied Motion BLuDC4-Si - Manual (Page 13)

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Other Digital Inputs
As we mentioned in the previous section, the high speed X1
and X2 inputs are configured for five volt logic. All other
digital inputs are designed for operation between 12 and 24
volts DC. This includes five inputs on the main board and
the eight digital inputs on the Si™ board.
Single Ended Inputs
The BLU servos include 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. Sometimes
"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
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.





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