44
AXIS 221 - The I/O Units Connectors
Schematic Diagram - Terminal Connectors
Example schematic diagram of the AXIS 221 Terminal Block Connector - showing possible
applications.
Pin Function Description
1 Output A The external device output terminals (A and B) there is no distinction between +
and
-. The terminals use a photocoupler and are electrically isolated from the other
internal circuitry.
The maximum load should not exceed 100mA and the maximum voltage should be
no higher than 50V DC. Note: Connecting AC to the output will damage the unit.
2 Output B
3 Digital Input 1-
Photocoupler Anode (+)
Photocoupled Input 1: Electrically isolated from the chassis and connectors, this
input can be supplied from an external DC voltage or the DC Power Input/Output on
pins 9 (DC+) and 10 (GND).
4 Digital Input 1-
Photocoupler Cathode (-)
5 Digital Input 2-
Photocoupler Anode (+)
Photocoupled Input 2. As above.
6 Digital Input 2-
Photocoupler Cathode (-)
7 RS-485 - A (non-inverting) A half-duplex RS-485 interface for controlling auxiliary equipment.
8 RS-485 - B (inverting)
9 DC + Power Output DC Power Output: It can drive the photo coupler inputs or other equipment. The out-
put voltage level is 3.0 V. A maximum current of 100mA can be sourced from the DC
output.
10 GND Ground.
o
o
Control
Device
o
o
o
o
A
B
3
4
5
6
7
8
External Device
Active
_
+
o
o
1
2
RS-485
Mains Power
24V DC
Appliance
Optional
Relay
Switch
o
o
o
o
o
o
o
o
o
9
10
+
-
Switch, etc.
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General
Weight and Dimensions
