B7A
B7A
33
Specifications
Characteristics
General
Normal speed
High speed
Communications method
Unidirectional, time-division multiplex
Transmission distance (see note 2)
500 m max.
100 m max. (see note 3)
I/O delay time
Typical: 19.2 ms; 31 ms max.
Typical: 3 ms; 5 ms max.
Minimum input time (see note 4)
16 ms (see note 5)
2.4 ms
Operating voltage range
12 to 24 VDC (10.8 to 26.4 VDC) (see note 2)
Insulation resistance
100 M
Ω
min. (500 V) between each terminal and external parts
Dielectric strength
1,000 VAC, 50/60 Hz for 1 min between each terminal and external parts
Noise immunity (see note 6)
Noise level: 1.5 kV; pulse width: 100 ns to 1
µ
s (on transmission line due to coupling)
Vibration resistance
10 to 55 Hz, 1.5-mm double amplitude
Shock resistance
300 m/s
2
Ambient temperature
Operating: –10 to 55
°
C (with no icing)
Storage:
–25 to 65
°
C (with no icing)
Ambient humidity
Operating: 35% to 85% (with no condensation)
Note:
1. If there is a possibility of noise interference from the power supply, input, and/or output lines, add appropriate noise protection cir-
cuits. Refer to
Noise Protection Circuits on page 101 for details.
2. The transmission distance values stated in this table are possible if the Input or Output Link Terminal is connected to an independent
power supply. If a single power supply is connected to the Input or Output Link Terminal, the supply voltage must be 24 VDC
±
10%,
in which case the transmission distance of a normal-speed model is 100 m maximum and that of a high-speed model is 50 m maxi-
mum. Refer to
Power Supply on page 36 for details.
3. A shielded transmission cable or a VCTF cable with a thickness of 0.75 mm
2
minimum must be used for signal transmission. If the
VCTF cable is used, however, the transmission distance will be 10 m maximum regardless of whether or not independent power
supplies for the Input and the Output Link Terminals are used.
4. The minimum input time is required for the B7A to read an input signal.
5. Set the timer of the PLC to 0.02 s minimum if a normal-speed model is connected to the PLC.
6. For high-speed models, these values are possible without grounding the shielded line.
Input Models
Item
16-point
32-point
B7A-T6E3/-T6E8
B7A-T3E3/-T3E8
Compatible inputs
PLC (NPN output), switches, three-wire NPN sensors
Input logic
Active low
Current consumption
(see note)
60 mA max. with all input terminals ON
100 mA max. with all input terminals ON
Input voltage range
0 VDC to supply voltage
Input current range
–1.5 to –0.6 mA/point (current flowing from input terminals)
ON/OFF threshold
No-contact input: ON voltage:
1.6 V max.
OFF voltage: 5.5 V min.
Contact input:
ON discrimination resistance:
1 k
Ω
max.
OFF discrimination resistance:
9 k
Ω
min.
Mounting strength
No damage when 49-N pull is applied for 1 min each in all directions
Terminal strength
No damage when 49-N pull is applied for 1 min each in all directions
Tightening torque
0.78 to 1.18 N
S
m
Weight
Approx. 46 g
Approx. 71 g
Note:
Consumption when all 16/32 points are ON. Excludes external sensor current for Input Terminals.