Hitachi HSC-2100, Hardware Manual

Page: 62 / 169

2 SPECIFICATIONS OF INDIVIDUAL MODULES
2-25
2.21 Model LWA401 Input Module (±5 VDC Voltage Input, 4 Channels)
Item Specification
Module input Voltage input
Input channels 4
Insulation method Photocoupler (common to four channels)
Rated input voltage 0 to ±5 VDC
Input voltage range ±6 V (including potential difference between channels)
A/D bits 12 (sign bit + 11 bits)
Conversion ratio 2,000 in digital value to 5 V
Overall accuracy
(room temperature)
±0.3% full scale (ambient temperature from 20 to 25°C)
Overall accuracy (0 to 55°C) ±0.6% full scale
Response time
6 + 5TRc ms or less (TRc: remote I/O transfer time)
6 + Rc ms or less (Rc: J.NET transfer time)
Input filter 6.5 dB at 60 Hz; Time constant, 5 ms
Input impedance
5 M Ω or more (when power to the module is ON);
approx. 3 k Ω or more (when power to the module is OFF).
Internal
consumption
current
12 VDC 150 mA or less
5 VDC 40 mA or less
Insulation withstand voltage 500 VAC, 1 minute (between external terminal and ground)
External wiring
Connection 20-point terminal block connector (Connector screw type: M3)
Applicable
cable size
0.5 to 1.25 mm
2
Tightening
torque
0.6 to 0.8 N·m
Maximum
wiring length
200 m (shielded twisted-pair cable)
Mass 340 g
„ The overall accuracy listed above is expressed as percentages of the
full scale value of this AI module.
„ The response time listed above does not include the delay time of
the input filter.
„ The symbol “E
CM
” shown right is the potential difference between
channels.
„ This AI module can only be used with the station’s number-of-
points setting set to 16.
If it is set to any other value (32 to 128), the module will not
function.
The module supports only the value 16.
Process side
Amplifier
A/D
LWA401
Internal
circuitry
Cubicle ground
+
-
+
-
+
-
+
-
C0
S1
C1
S2
C2
C3
S0
S3
SHD
SHD
SHD
SHD
GND
HITACHI
1
2
3
4
5
6
7
8
9
11
10
S0
C0
LWA401 AI
A.INPUT
DC
±
5V
SHD
12
13
14
15
16
17
18
19
20
S1
C1
SHD
S2
C2
SHD
S3
C3
SHD
GND
Process side
Internal
circuitry
E
E
CM
S
C
S
C