●
Terminal layout
+24V
COM
I+
DB
COM
P+
DA
SG
1
2
3
4
5
6
7
8
9
10
11
Wiring label
Terminal No. Signal name
Description
1
DA
RS-485 communication DA
2
DB
RS-485 communication DB
3
Unused
Do not use
4
Unused
Do not use
5
P+
Pulse output (NPN open collector)
6
COM
Common
7
SG
RS-485 communication common
8
+24V
24 V power
9
COM
Common
10
I+
4 to 20 mA output
11
Ground terminal
Handling precautions
•
Connect each terminal securely using crimp type terminal lugs to ensure firm
contact area.
•
Use crimp type terminal lugs applicable to M4 screw.
•
Be sure that the tightening torque of terminal screw is less than 0.8 N·m.
•
Use the JIS C 3401 cables for control (CVV etc.) of less than 2.2 mm dia. for the
wiring except RS-485 communications.
However, if there is a risk of power surge due to lightning on a signal line, use a
shielded cable.
•
Use the twisted-pair shielded cables for the wiring of RS-485 communications.
Be sure to apply terminating resistors (150 Ω 1/2 W).
For communications of wiring details, refer to;
MVF050/080/100/150 Micro Flow Vortex Gas Flowmeter User’s Manual for
Communications (CP-SP-1183E).
15
Chapter 3. INSTALLATION, MOUNTING, WIRING
