Schneider ASBDAP216N Current Source Module

The Schneider ASBDAP216N Current Source Module provides 16 isolated current inputs for Modicon PLC systems. This module accepts 4-20 mA signals from transmitters and sensors. You will find it in process control applications like pressure and flow monitoring. It delivers 16-bit resolution for accurate measurement of process variables. Therefore, this unit suits chemical, oil and gas, and water treatment facilities.

The Schneider ASBDAP216N Current Source Module measures 130 mm in height and 45 mm in width. Its depth reaches 100 mm for standard rack mounting. The unit weighs approximately 0.44 kilograms. It contains one 16-bit ADC with 16 multiplexed inputs. Sixteen isolation barriers separate field circuits from the backplane. Additionally, you get sixteen status LEDs for channel diagnostics.

Key Technical Specifications

Parameter	Value
Manufacturer	Schneider Electric
Model	ASBDAP216N
Product Type	Current Source Module
Number of Channels	16 (differential)
Input Signal	4-20 mA
ADC Resolution	16 bits (65,536 steps)
Accuracy	±0.1% of full scale
Input Impedance	250 ohms
Channel Isolation	1500 VAC (optical)
Update Rate	25 ms per channel
Height	130 mm
Width	45 mm
Depth	100 mm
Weight	0.44 kg
ADC Count	1 (16-bit)
Isolation Barriers	16 (optical)
Status LEDs	16 (green)
Energy Storage	≈ 240 µF (capacitive)
Power Consumption	220 mA @ 5 VDC
Loop Supply	External 24 VDC
Operating Temperature	0°C to +55°C
Terminal Type	Screw (20-pin)

Internal Architecture and Energy Storage

The Schneider ASBDAP216N Current Source Module stores minimal energy in its input filters. Small electrolytic capacitors hold approximately 240 microfarads total capacitance. A single 16-bit ADC multiplexes through all 16 input channels sequentially. This ADC provides 65,536 discrete steps across the 4-20 mA range. Sixteen optical isolators protect the backplane from field wiring transients. Each channel has a programmable gain amplifier for signal conditioning. The module includes a precision voltage reference at 2.5 VDC. Sixteen green LEDs light up when their respective channel receives a valid signal.

Connection Interfaces and Wiring Details

You will find a 20-pin removable terminal block on the bottom face. This block accepts 16 current loop pairs plus shield connections. Connect the transmitter positive wire to the channel + terminal. Connect the transmitter negative wire to the adjacent – terminal. The Schneider ASBDAP216N Current Source Module requires an external 24 VDC loop supply. Connect the loop supply positive to the transmitter positive wire. Connect the loop supply negative to the module’s common terminal. Use shielded twisted-pair cable for all analog signal runs. Connect the shield drain wire to the ground terminal only. Sixteen green LEDs light up when their respective channel receives a valid 4-20 mA signal.

Configuration and Installation Steps

You slide this module into any I/O slot of the Modicon rack. First, align the module with the upper and lower card guides. Then, push it firmly until the backplane connector seats completely. Secure the front panel with the two retaining screws. Connect all field wiring before applying power to the system. The Schneider ASBDAP216N Current Source Module requires no jumpers or dip switch settings. Use the PLC programming software to read the input registers. Map each analog channel to a specific %IW memory address. The module automatically scales 4-20 mA to 0-65,535 digital counts. Test each channel with a loop calibrator before connecting field sensors.