Datasheet

750-491
1
250
1-Channel Analog Input Module for Resistor Bridges (Strain Gauge)
Delivered without miniature WSB markers
+V
ref
Data contacts
Error V
ref
-V
ref
+V
V
(5 V)
Shield
(screen)
Error V
D
Function V
D
+V
D
Shield
(screen)
-V
D
-V
V
(0 V)
Function V
ref
+V
ref
+V
V
+V
D
-V
D
-V
ref
-V
V
The power supply V
V
can be obtained from
the I/O module or can
be feed in external. The
I/O module supplies 5 V.
The maximum input
voltage U
ref
is limited to
6 V.
+UD +UR
-UD
-UR
0V
5V
S
S
13
14
C
D
B
A
750-491
+V
ref
+V
D
Shield
(screen)
Shield
(screen)
Logic
A
D
Function
-V
V
-V
D
-V
ref
Error
+5 V
+V
V
+V
ref
+V
D
-V
ref
-V
D
+V
V
-V
V
V
D
V
ref
V
D
V
ref
750-491
1
2
3
4
5
6
7
8
The I/O module enables the direct connection of a resistor measurement
bridge. The bridge voltage VD and supply voltage Vref of the bridge are
digitized with a resolution of 16 bits.
The two input channels for the resistor bridge are available as two 16 bit
values for further processing. The result of measurement can be calculated by
the formula: Measured value = V
D
/ V
ref
.
Field and system levels are electrically isolated.
Description
Item No.
Pack.
Unit
1AI for Resistor Bridges 750-491 1
1AI for Resistor Bridges/ 125ms 750-491/000-001 1
Conversion time 125 ms, Filter 200 Hz
Accessories
Item No.
Pack.
Unit
Miniature WSB Quick marking system
plain 248-501 5
with marking see pages 352 ... 353
Approvals
Conformity marking 1
Technical Data
Number of inputs 2, for one resistor bridge
Power supply via system voltage DC/DC
Current consumption typ. (internal) 65 mA
Signal voltage V
D
-15mV ... +15mV
Signal voltage V
ref
+2V ... +6V
Internal resistance > 200 kΩ (V
ref
), > 1 MΩ (V
D
)
Voltage supply Vv 5 V DC, 20 mA
Resolution 16 bits
Conversion time 500ms
Measuring error V
D
: ± 30 μV; V
ref
: ± 10 mV
Filter 50 Hz
Isolation 500 V system/supply
Bit width 2 x 16 bits data
2 x 8 bits control/status (optional)
Wire connection CAGE CLAMP
®
Cross sections 0.08 mm² ... 2.5 mm² / AWG 28 ... 14
Stripped lengths 8 ... 9 mm / 0.33 in
Width 12 mm
Weight 53 g
EMC: 1 - immunity to interference acc. to EN 61000-6-2 (2005)
EMC: 1 - emission of interference acc. to EN 61000-6-4 (2007)
WAGO Kontakttechnik GmbH & Co. KG
Subject to design changes 18.05.2012
Postfach 2880 - D-32385 Minden
Hansastr. 27 - D-32423 Minden
Phone: [phone] E-Mail: [e-mail]
Fax: [phone] www.wago.com