Hitachi MICRO-EHV+ - Obv-485 Tai;485 Tao;Aio

Chapter 2 Specifications
2 – 39
2.20.3 OBV-485TAI/485TAO/AIO
Name and function of each part
Type
OBV-485TAI/485TAO/AIO
Weight
20g (0.04 lb.)
(4) Connector to basic unit
(Back side)
(1) Communication port or
Analog input terminal
(3) LED
(2) Analog input terminal or
Analog output terminal
No.
Type
Item
Description
(1)
OBV-485TAI
/485TAO
Communication
port
supports dedicated protocol, general purpose and Modbus-RTU functions.
[Programming] Communication with HMI or programming software etc.
[General purpose] Communication with external equipments controlled by user program.
[Modbus-RTU] Communication with external equipments supporting Modbus-RTU protocol.
Use shielded twisted pair cable.
OBV-AIO
Analog
Input terminal
Terminals to connect analog voltage signals
Cable diameter : Single wire : 0.2 mm
2
to 1.5 mm
2
Strand wire : 0.2 mm
2
to 1.0 mm
2
(2)
OBV-485TAI
OBV-485TAO
Analog
Output terminal
OBV-AIO
(3)
OBV-485TAI
/485TAO
LED
SD：blinks when data is sent
RD：blinks when data is sent or received.
OBV-AIO
-
There is no LED
(4)
Common
Connector
A connector is located at the back side to connect basic unit.
Communication port signal and internal circuit
Terminal layout
No.
Signal
Meaning
Internal circuit
4
1
....
Terminal
(Top view)
[1]
SDP
Data +
M
P
U
① SDP
② SDN
③ TERM
+
-
-
+
④ SG
120
[2]
SDN
Data -
[3]
TERM
Termination resistor
[4]
SG
Signal ground
Analog Input signal and internal circuit (each “–“ signal connected internally)
Terminal layout
No.
Signal
Meaning
Internal circuit
4
1
....
Terminal
(Top view)
[1]
IN1+
CH1+
M P U
① IN1+
③ IN2+
② IN1-
④ IN2-
[2]
IN1-
CH1-
[3]
IN2+
CH2+
[4]
IN2-
CH2-
Analog Output signal and internal circuit (each “–“ signal connected internally)
Terminal layout
No.
Signal
Meaning
Internal circuit
4
1
....
Terminal
(Top view)
[1]
OUT1+
CH1+
M P U
① OUT1+
③ OUT2+
② OUT1-
④ OUT2-
[2]
OUT1-
CH1-
[3]
OUT2+
CH2+
[4]
OUT2-
CH2-