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Chapter 2
■Serial communication
(Wiring example)
Modbus communication
CM1
SP
(+)
Connect CM1
Into the SG (signal ground) of
external devices,
Terminal
Connect CM1
Terminal name
label
Into the SG (signal ground) of
external devices,
SP
Connect CM1
SN
Into the SG (signal ground) of
RP
(CM1)
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
■24V power supply input/output
(Wiring example)
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Terminal
Into the SG (signal ground) of
Terminal name
label
external devices,
P24
24V output power source terminal
Connect CM1
Into the SG (signal ground) of
CM1
Reference terminal for 24V output
external devices,
P+
Terminal for external 24V input (24V)
Connect CM1
Into the SG (signal ground) of
external devices,
P-
Terminal for external 24V input (0V)
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
SN
SP
SN
RP
(-)
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
Description
resistor, short-circuit between
SP terminal:
RS-485 differential(+) signal
RP and SN.
SN terminal:
RS-485 differential(-) signal
RP terminal:
Connect to SP through a termination
MODBUS
resistor
For enabling the termination
terminal
CM1 terminal: Connect to the signal ground of
resistor, short-circuit between
(RS-485)
external communication devices.
RP and SN.
There are two SP and two SN terminals, which are
connected internally.
The maximum baud rate is 115.2kbps.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
Control circuit terminal
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
External 24V
Power supply
For enabling the termination
24V terminal
terminal
resistor, short-circuit between
RP and SN.
P24
P+
For enabling the termination
resistor, short-circuit between
RP and SN.
External DC24V power supply
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
Control circuit terminal
•
SP and SN with the same name are internally connected, which are
available for a plurality of wiring.
•
For the use of Modbus communication, contact to your supplier or
local Hitachi distributor or service station to obtain a more
detailed description..
P-
•
Connecting DC24V external power supply into the terminal P+ and
P-, permit to change parameters and perform optional
communication without the main power source. Is also allowable
when connecting into the main power supply.
Description
This terminal supplies DC24V
power for contact signals.
This serves as a 0V reference
terminal for contact signal.
This is used also as a common
terminal for FM output.
Input external DC24V power
supply to the inverter.
24V power supply input permit
to change parameter settings
and perform optional
communication operations
without control power supply.
2-21
Installation and Wiring
Electric characteristics
Termination resistor (120Ω) integrated
Enabled: RP-SN shorted
Disabled: RP-SN opened
Electric characteristics
Max. output 100mA
Allowable input voltage
DC24V±10%
Max. allowable current 1A
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