Mitsubishi EMU4-BM1-MB User Manual page 14

5.3.2 Connection of external input / external output
In case using external input and/or external output, refer to the following.
External input：For the case of contact input
No-voltage a-contact
/ open collector
Voltage of the contact is 5V DC,
and current is 7mA, so use
something appropriate for the
switching condition.
External output：For the case of contact output
Relay
• Wiring length of pulse input (Reference value)
The wire length for each wire diameter is below. Please refer to wiring.
※Polyethylene insulating vinyl sheath cable FCPEV wire.
5.3.3 System configuration example of MODBUS communication
●Connection of MODBUS communication terminals:
1. Use the twisted shielded pair cable for transmission lines.(Recommended cable
2. Connect the termination resistances (120Ω) to both ends of the devices connected the MODBUS transmission line.
Termination resistances of 120Ω can be used by short-circuiting "485-" and "Ter" terminals.
3. Connect to ground by using thick wires to decrease impedance.
4. MODBUS transmission lines shall not be placed close to or bound together with the high-voltage lines.
5. Ground the "SLD" terminal at one end.
Wire diameter [mm] Resistivity[Ω/km]
0.5
0.65
0.9
1.2
External input: For the case of pulse input
Transmitter
External output: For the case of pulse output
Counter
Wiring length[m]
94 300
56.8 400
29.2 750
16.5 1000
11.2)
13
No-voltage a-contact
/ open collector
Voltage of the contact is 5V
DC, and current is 7mA, so
use something appropriate
for the switching condition.
Please connect GND side to
COMX1 when output
transmitter is open collector pulse.
of