OPT-SNAP-AILC

SNAP-AILC SNAP Load Cell Input Module, 10 VDC Excitation, 2 or 3 mV/V Input Sensitivity

The SNAP-AILC input module works with 2 mV/V and 3 mV/V load cells as a load cell front end. Using a separate 24 VDC
power source (purchased separately), the module provides isolated 10 VDC bridge excitation for up to four 350 ohm or
415 ohm load cells.
 
Part of the SNAP PAC System, the module mounts on a SNAP PAC rack with a SNAP PAC brain or rack-mounted
controller. Analog, digital, and serial I/O modules can all be on the same rack. Such an I/O unit is also well suited for PC-
based control or for use as intelligent remote I/O for an Allen-Bradley RSLogix PLC system, such as ControlLogix,
MicroLogix, or CompactLogix.
 
NOTE: In addtion to SNAP PAC brains and R-series controllers, this module also works with the following legacy brains, if
they have firmware version R6.1c or newer: SNAP-B3000-ENET, SNAP-ENET-S64, SNAP-UP1-ADS, and SNAP-UP1-M64.
 

Input Range Sensitivity:   SNAP-AILC   SNAP-AILC-2	2 mV/V or 3 mV/V (Over range ± 2.2 mV or ± 3.3 mV) 3 mV/V or 4 mV/V (Over range ± 3.3 mV or ± 4.4 mV)
Input Resistance	100 Megohms differential
Resolution: Analog Scale Points	>22 bits + sign (± 6,400,000 counts = ± 100% of scale)
Response Time, Data Freshness	See the following table
DC Reversal (Input)	0.015% (±1000 counts of reading @ 6,400,000 F.S.)
DC Common Mode Rejection	>-120 dB
AC Common Mode Rejection	>-120 dB at 60 Hz
Maximum Survivable Input	± 15 volts across module load cell connector
Maximum Operating Common Mode Voltage	250 V
Accuracy (% Full Scale):   Offset   Gain	± 0.05% (= 3,200 counts out of 6,400,000, out of box) ± 0.05% (= 3,200 counts out of 6,400,000, out of box)
Usable Resolution at Default Configuration (Fast)	38 nV - sign and 19 bits (±524,288 counts @ channel 2) At filter weight 64, settles to 99.9% of final reading in 3.9 s.
DRIFT:   Gain   Offset	40 PPM / °C 10 PPM / °C
Isolation: Optical	4000 V
Isolation: Transformer	1500 V
Rack Power Requirements	5.00 VDC to 5.20 VDC @ 120 mA
24V Bridge Supply:   Input Voltage   Input Current   Output Fault Current	24 VDC nominal (22 V min. to 30 V max.) 40 mA for one load cell or 115 mA for four load cells 124 mA typical (field fault—shorted bridge)
Ambient Temperature:   Operating   Storage	0 to 70 °C -25 to 85 °C
Torque, hold-down screws	4 in-lb (0.45 N-m)
Torque, connector screws	5.26 in-lb (0.6 N-m)
Agency Approvals	CE, RoHS, DFARS
Warranty	Lifetime

Rev: 04/13