Schneider ASB875111 Analog Input Module

This module converts analog field signals into digital values for Schneider Modicon Premium PLCs. It accepts voltage or current inputs from sensors and transmitters. Therefore, it enables precise process monitoring in industrial automation systems.

Physical and Power Specifications

The Schneider ASB875111 measures 13.5 cm in length and 10.0 cm in width. Moreover, its module weight equals approximately 0.24 kg for rack mounting. A single 20-pin removable terminal block handles all field wiring connections. Additionally, this module provides eight independent analog input channels.

Parameter	Specification
Brand	Schneider Electric
Full Model	ASB875111
Category	Analog Input Module
Dimensions (L x W x H)	13.5 cm x 10.0 cm x 6.0 cm (5.31″ x 3.94″ x 2.36″)
Module Weight	0.24 kg (0.53 lbs)
Primary Interface	1 x 20-pin Removable Screw Terminal Block
Analog Input Channels	8 Single-Ended Channels
Input Signal Range (Voltage)	0 to +10 VDC, -10 to +10 VDC, 0 to +5 VDC
Input Signal Range (Current)	0 to 20 mA, 4 to 20 mA (with External Resistor)
Resolution (Voltage Mode)	12 Bits (0 to 4095 Counts)
Resolution (Current Mode)	12 Bits (0 to 4095 Counts with 250Ω Resistor)
Conversion Type	Successive Approximation (SAR)
Conversion Speed	4 ms per Channel (32 ms for All 8 Channels)
Input Impedance (Voltage)	200 kΩ (Typical)
Input Impedance (Current)	250 Ω (with External Resistor)
Absolute Accuracy	±0.5% of Full Scale at 25°C
Absolute Accuracy Drift	±0.02% per °C
Common Mode Rejection	80 dB (50/60 Hz)
Normal Mode Rejection	60 dB (50/60 Hz)
On-Board Components	1 ADC Chip + 8 Signal Conditioning Circuits + 4 Protection Diodes + 1 EMI Filter
Energy Storage	2 x 47 µF Electrolytic Capacitors (35V) + 2 x 10 µF Tantalum Capacitors (25V)
Operating Voltage	+5 VDC from Backplane (0.15 A Typical)
Power Consumption	0.75 W (Typical)
Isolation Rating	1500 Vrms (Field to Logic)
Common Mode Range	±10 VDC Maximum
Operating Temperature	0°C to +55°C (32°F to 131°F)
Mounting Type	Premium PLC Rack
Status Indicators	1 Green LED (Power) + 1 Green LED (Active) + 1 Red LED (Fault)

Input Channel Features and Signal Conditioning

The Schneider ASB875111 accepts eight analog input signals in voltage or current modes. For instance, each channel includes a dedicated signal conditioning circuit for accurate conversion. In addition, the input impedance of 200 kΩ minimally loads voltage-type sensors. Moreover, the 12-bit resolution provides 4096 discrete steps for each input range. Consequently, this module delivers precise measurement for industrial process variables.

Energy Storage and Signal Integrity

This module stores energy using four onboard capacitors for power filtering. Specifically, two electrolytic capacitors smooth the 5 VDC supply for stable ADC operation. In addition, two tantalum capacitors provide high-frequency noise suppression for analog circuits. Furthermore, these capacitors maintain conversion accuracy during brief power interruptions. Therefore, the Schneider ASB875111 rejects electrical noise from factory environments effectively.

Conversion Speed and Accuracy Features

This analog input module converts each channel in just 4 milliseconds. In addition, the successive approximation method ensures fast and repeatable readings. Moreover, internal filtering provides 80 dB of common mode rejection at 50/60 Hz. Thus, this module ignores noise from AC power lines and variable frequency drives.

Installation and Diagnostic Indicators

You will find three LED indicators on the module’s front panel for diagnostics. First, a green Power LED lights when the 5 VDC backplane supply is present. Second, a green Active LED flashes during normal analog conversion operation. Third, a red Fault LED indicates hardware errors or out-of-range signals. Additionally, the removable terminal block accepts 16-22 AWG shielded wires. Therefore, this module fits seamlessly into any standard Modicon Premium I/O slot.