Hioki 3522-50 - Circuit Construction and Connections for the EXT I;O Connector

136
────────────────────────────────────────────────────
5.5 The EXT I/O Connector
────────────────────────────────────────────────────
5.5.3 Circuit Construction and Connections for the EXT I/O
Connector
CAUTION
The insulation of the signal lines is for eliminating mutual influences
between the signals. Any device which is connected to the 3522-50
unit should always be properly protectively grounded. If proper
connection to a protective ground is not established, there is a danger
of damage to the insulation.
The voltage of the external DC power supply to be connected to the
EXT DCV and EXT COM terminals should be from 5 V to 24 V. Do
not supply DC voltage greater than 24 V. If you do, there is a danger
of damage to the unit.
Moreover, for driving the circuitry, connect any device which is
capable of providing an output current of more than 200 mA.
Internal DC power supply (5 V)
INT.DCV
External DC power supply (5 V to 24 V)
EXT.DCV
M
−
HI
----------------
M
−
IN
-----------------
EOM
--------------
TRIG
---------------
LD5
-----------
External DC power supply (COM)
EXT.COM
Internal DC power supply (COM)
INT.GND
Pull up resistors
4.7 kΩ (1/4 W)
Ground connection to the chassis of the unit
* Connect when using the
internal 5V power supply.
4.7 kΩ (1/4 W)
*
Circuit Construction
*
The circuit construction for the EXT I/O connector is shown in the figure.
Except for the power supply lines, all of the input and output signal lines are
insulated by photocouplers.