Model Explanation

B875 = 8-channel analog input series; 012 = Fixed ±10V differential special model

001: Fixed 4-20mA/1-5V single-ended

002: Multi-range single-ended universal

011: Full-range + single-ended / differential dual-purpose

012: Factory-fixed ±10VDC, default differential, incompatible with current signals, cannot be switched for current / other voltage ranges Technical Specifications

Channels: 8-channel fixed differential input, cannot be changed to single-ended; 250VAC isolation between channels, 300VAC withstand isolation between channels and the backplane

Fixed range: Only one input of **-10VDC to +10VDC**, no 4-20mA, 0-5V, 1-5V ranges, no range jumpers on the board

Input impedance: 1MΩ (full channel voltage input), no built-in 250Ω sampling resistor, cannot connect two-wire current transmitters

AD specification: 13-bit high-precision analog-to-digital conversion, 25℃ linear error ≤ ±0.05% FS, single channel accuracy approximately 17mV

Full-channel scanning: 710ms complete refresh cycle for 8 channels

Backplane power consumption: 5VDC power supply from the rack, rated 300mA for the entire unit, no need for external on-site power supply

Dimensions: 51 (W) × 203 (H) × 280 (D) mm, net weight 0.84kg

Indicators: RUN running green light, OVER over-range red light, UNDER under-range red light

Environmental parameters: Operation 0-60℃, storage -40-85℃, humidity ≤ 80% RH without condensation, IP20 protection

Interfaces and matching base

Original factory screw terminal base: AS-8535-000, compatible with differential displacement sensors, force sensors, millivolt-level instrument wiring. Core function

It is specifically designed to collect industrial differential ±10V displacement, pressure and weighing sensor signals. The differential wiring effectively suppresses long-line industrial interference. The over-limit indicator light alerts when the signal exceeds the ±10V range. It does not have a broken line current detection function. Applicable scenarios

Chemical, papermaking, and metallurgy old 984PLC renovation, the weighing module, displacement encoder, and force sensor are centrally collected at the workstations, and all on-site are ±10V differential instrument points.

Operation and Maintenance

The module is directly inserted into the 800 rack slot, without range jumper, and without single-ended/differential switching jumper; OVER red light > +10V, UNDER red light < -10V; It is prohibited to connect 4-20mA transmitters, and cannot be changed to current collection through hardware modification; It can be used in the same rack with the full series of B875, B873, and B872 modules.