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FOUNDATION Fieldbus-compliant ALTImass series
L-740FF-1-E
7
(
1
)
Power supply (main power supply) lines and ground terminal
In addition to fieldbus power supply (for fieldbus communication segment), this device requires AC or
DC power supply for its main power.
Supply the appropriate power according to the power supply rating below.
For details, refer to "7.2 Power Supply Lines and Ground Terminal" in Instruction Manual L-740.
Cable specification
Size
Max. cable length
Impedance
Specific resistance Attenuation
Type A
Twisted pair cable (pair shield)
18AWG 0.8mm
2
1900m
100
Ω
22
Ω
/km
3dB/km
Type B
Twisted pair cable (common shield) 22AWG 0.32mm
2
1200m
100
Ω
56
Ω
/km
5dB/km
Type C
Twisted pair cable (unshielded) 26AWG 0.13mm
2
400m
Not specified
132
Ω
/km
8dB/km
Type D
Parallel cable (common shield) 16AWG 1.25mm
2
200m
Not specified
20
Ω
/km
8dB/km
Cable specifications in above table are based on IEC 61158-2: "Digital data communications for
measurement and control-fieldbus for use in industrial control systems – Part 2: Physical layer
specification and service definition"
Transmission distance is restricted by cable specifications. (See table below.)
FOUNDATION fieldbus communication recommended cable
(
2
)
Wiring communication signal cable
For fieldbus communication, power supply from fieldbus is required for fieldbus communication
segment and communication signal cables serve as power supply cables.
Supply the appropriate power according to the power supply rating below.
Power supply
Terminals used
Rated power supply
Main power supply
L
(+)
to N
(-)
AC power type:
85 to 264VAC (safety rated 100 to 240 VAC), 50/60Hz
DC power type:
20 to 30VDC
Power supply
Terminals used
Rated power supply
Fieldbus power supply I/O
(+)
to I/O
(-)
9 to 32VDC
Use of a cable specified by IEC 61158-2 is recommended.
NOTE:
Available cable length differs according to actual installation condition in the field. For details,
refer to the following document, etc.
・
FOUNDATION Fieldbus Application Guide AG-140;
"Wiring and Installation; 31.25 kbit/s, Voltage; Mode, Wire Medium"
NOTE: