B7A/B7AS
B7A/B7AS
17
Specifications
Characteristics
General
Normal
speed
High speed
Communications method
Unidirectional, time-division multiplex
T
ransmission distance (see note 1)
500 m max.
100 m max. (see note 2)
I/O delay time
T
ypical: 19.2 ms; 31 ms max.
T
ypical: 3 ms; 5 ms max.
Minimum input time (see note 3)
16 ms
2.4 ms
Operating voltage range
12 to 24 VDC (10.8 to 26.4 VDC) (see note 1)
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 4)
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. 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
21 for details.
2. 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.
3.
The minimum input time is required for the B7A/B7AS to read an input signal.
4.
For high-speed models, these values are possible without grounding the shielded line.
Input Models
Item Screw
terminal models
B7A-T6A1/-T6A6 B7A-T6B1/-T6B6 B7AS-T6B1/-T6B6
Compatible inputs
(see note 1)
Switches, two-wire sensors with DC output, three-wire NPN sensors
Input logic
Active low
I/O delay time
B7Aj-T6j
1: normal speed (typical 19.2 ms); B7A
j-T6j
6: high speed (typical 3 ms)
Current consumption
(see note 2)
120 mA max. with all input terminals ON
Operating voltage range
12 to 24 VDC
Input voltage range
0 VDC to supply voltage
Input current range
–6 to –3 mA/point (current flowing from input terminals)
Minimum input time
B7Aj-T6j
1: 16 ms; B7A
j-T6j
6: 2.4 ms
ON/OFF threshold
No-contact input:
ON voltage:
4 V max.
OFF voltage:
6 V min.
Contact input:
ON discrimination resistance:
660
Ω
max.
OFF discrimination resistance:
2 kΩ
min.
Mounting strength
No damage when 49-N pull is applied for 1 min each in all directions (except in direction of DIN track)
T
erminal strength
No damage when 49-N pull is applied each in all directions
T
ightening torque
0.78 to 1.18 N
S
m
Weight
Approx. 160 g Approx. 130 g
Note: 1. All
B terminals of the B7A-T6A
j
are negative terminals; power must be supplied to the three-wire sensor via the positive
power
supply
terminal or from an independent power supply
.
T
wo-wire sensors must satisfy the following requirements:
Residual voltage:
4 V max.
Current leakage: 1.5 mA max.
The lower limit of control output:
3 mA (Use a breeder resister to eliminate this restriction.)
2.
Consumption when all 16 points are ON. Excludes external sensor current for Input T
erminals.
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