Page 278 - Wago_AutomationTechnology_Volume3_2015_US.pdf

750-491

4 1-Channel Analog Input Module for Resistor Bridges (Strain Gauge)

276

13 14
A
Function V D C Function V ref
B
Error V D D Error V ref
+UD +UR
Data contacts
1 5 +V D
+V V
+V D +V ref +V D +V ref +V ref
+V ref
A
-UD -UR Logic
D
2 6 -V D
+V D -V D -V ref
-V D -V ref -V ref
-V D Function V D
V ref
0V 5V
Error V D
V ref
3 7 -V V
-V ref +5 V
-V V (0 V) +V V -V V +V V +V V
(5 V) -V V
S S The power supply V V
can be obtained from
the I/O module or can 4 8
be feed in external. The
Shield Shield I/O module supplies 5 V. Shield Shield
(screen) (screen) The maximum input (screen) (screen)
750-491 voltage U ref is limited to 750-491
6 V.
Delivered without miniature WSB markers
The analog input module enables the direct connection of a resistor measure- Field and system levels are electrically isolated.
ment bridge. The bridge voltage V and supply voltage V of the bridge are
D ref
digitized with a resolution of 16 bits.
The 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 /V .
D ref
Description Item No. Pack. Technical Data
Unit
1AI for Resistor Bridges 750-491 1 Number of inputs 2, for one resistor bridge
1AI for Resistor Bridges / 125ms 750-491/000-001 1 Power supply via system voltage DC/DC
Conversion time 125 ms, Filter 200 Hz Current consumption typ. (internal) 65 mA
-15mV ... +15mV
Signal voltage V D
+2V ... +6V
Signal voltage V ref
Internal resistance > 200 kΩ (V ref ), > 1 MΩ (V D )
Voltage supply Vv 5 V DC, 20 mA
Resolution 16 bits
Conversion time 500 ms
Measuring error V D : ± 30 μV; V ref : ± 10 mV
Filter 50 Hz
Isolation 500 V system/supply
Accessories Item No. Pack. Bit width 2 x 16 bits data
Unit 2 x 8 bits control/status (optional)
Miniature WSB Quick marking system Wire connection CAGE CLAMP ®
plain 248-501 5 Cross sections 0.08 mm² ... 2.5 mm² / AWG 28 ... 14
with marking see Section 11 Strip lengths 8 ... 9 mm / 0.33 in
Width 12 mm
Weight 60 g
EMC immunity of interference acc. to EN 61000-6-2
Approvals EMC emission of interference acc. to EN 61000-6-4
Conformity marking 1
Korea Certification