The IC694ALG223-FC is a high-density PACSystems RX3i analog input module designed for current-loop acquisition. It provides 16 single-ended analog input channels and supports selectable 0–20 mA and 4–20 mA current ranges. The module is intended for rack-based RX3i control architectures where multiple process-current signals must be acquired in a compact I/O position.
CHANNELS
16
single-ended current inputs
RESOLUTION
12-bit
analog conversion
UPDATE RATE
13 ms
all 16 channels
CURRENT INPUT / HIGH DENSITY / RX3i
CURRENT LOOP / 16 POINT
Analog Acquisition Architecture
Input Type
Analog current input, 16 channels, single-ended
Input Ranges
0–20 mA and 4–20 mA selectable per channel; enhanced 4–20 mA range is also supported
Conversion
12-bit resolution with approximately 13 ms update rate for all 16 channels
Input Impedance
250 Ω
Low-Pass Response
19 Hz input low-pass filter response
Cross-Channel Rejection
Greater than 80 dB from DC to 1 kHz
External Supply
20–30 VDC external user supply; specified ripple limit 10%
Power Consumption
120 mA from the +5 VDC backplane bus and approximately 65 mA from 24 VDC external user power, in addition to current-loop consumption
Isolation
Optical field-to-backplane and field-to-frame-ground isolation; 250 VAC continuous and 1500 VAC for 1 minute
Operating Architecture
Rack-based PACSystems RX3i I/O architecture for process and machine-control applications
◎
PROCESS CURRENT
4–20 mA transmitters
◌
DENSE I/O
16 channels in one module
⌁
SIGNAL FILTERING
19 Hz low-pass response
◇
RX3i BACKPLANE
Rack-based integration
RX3i Family Positioning
The IC694ALG223-FC is the current-input member of the RX3i high-density analog I/O group. Selection should follow signal type, channel count and installed rack architecture.
Module / Family Role
Primary Signal
Typical Selection Logic
Key Difference
IC694ALG223-FC
Current
When the field devices provide 0–20 mA or 4–20 mA loops
16-channel current acquisition
RX3i Voltage-Input Modules
Voltage
When the transmitter or sensor output is voltage rather than current
Different electrical input range and signal interface
RX3i Mixed / Advanced Analog I/O
Application-dependent
Used where signal type, diagnostics or specialty functions require another module
Different channel architecture and feature set
RX3i CPU315 Family
Control processing
CPU selection is driven by processing, memory and communications requirements
Controller rather than analog input function
Selection focus: choose IC694ALG223-FC when the installed RX3i architecture requires high-density current-loop acquisition. Confirm the exact revision, terminal arrangement and installed rack configuration before replacement.
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Request IC694ALG223-FC
For quotation and availability, please provide the part number, quantity, destination, required date and machine/system application.
01 · Does IC694ALG223-FC fit an RX3i application that uses 4–20 mA transmitters?
Yes. Its input architecture is intended for current-loop acquisition and supports 4–20 mA as well as 0–20 mA ranges. The engineering check should focus on the existing RX3i rack, channel wiring and the exact module revision.
02 · Is IC694ALG223-FC suitable when all 16 current inputs need to be updated within the same scan interval?
The module specifies an approximately 13 ms update rate for all 16 channels. This makes the high-density configuration useful when many current-loop signals must be acquired without distributing them across multiple lower-density modules.
03 · What should be checked when replacing an earlier IC694ALG223 version with IC694ALG223-FC?
Match the complete article code and revision, then verify rack position, terminal arrangement, field wiring, channel configuration and the expected current range for each loop. A similar base model number alone should not be treated as proof of interchangeability.
04 · Can IC694ALG223-FC be selected where signal isolation is important?
The module provides optical isolation between the field side and the backplane/frame-ground path, with a specified 250 VAC continuous and 1500 VAC for one minute isolation rating. System-level grounding and wiring practices still need to match the installed control architecture.
05 · Why choose IC694ALG223-FC instead of adding several smaller current-input modules?
The main selection advantage is channel density: 16 current inputs are consolidated into one RX3i I/O module. For a system with many 4–20 mA loops, this can simplify rack planning and keep related process signals together while retaining the RX3i architecture.
Return & Replacement
Please contact us within 7 days after receipt if there is any issue. Returned items should remain in their original condition and include a specific return reason. After the returned item is received, we can arrange a return or replacement according to the confirmed order. Shipping costs associated with the return are the buyer's responsibility.
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