B7A
B7A
33
Specifications
Characteristics
General
Normal
speed
High speed
Communications method
Unidirectional, time-division multiplex
T
ransmission distance (see note 2)
500 m max.
100 m max. (see note 3)
I/O delay time
T
ypical: 19.2 ms; 31 ms max.
T
ypical: 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 V
AC, 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)
V
ibration 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 T
erminal is connected to an independent
power
supply
. If a single power supply is connected to the Input or Output Link T
erminal, 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 T
erminals 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 kΩ
max.
OFF discrimination resistance:
9 kΩ
min.
Mounting strength
No damage when 49-N pull is applied for 1 min each in all directions
T
erminal strength
No damage when 49-N pull is applied for 1 min each in all directions
T
ightening 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 T
erminals.
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