Module overview and key specs
The Siemens 7MH4134-6LB00-0DA0 is a 2-channel analog input module with differential inputs, designed for the SIMATIC S7-1200 / ET 200SP system. It provides 32 bytes of input data and 8 bytes of output data, operating at a rated supply voltage of 24 VDC with a typical power loss of 1.5 W. The module supports oversampling on 2 channels per module, with a minimum resolution of 100 µs, making it suitable for applications requiring high-speed, synchronized data acquisition. It includes I&M data (I&M0 to I&M3) for device identification and maintenance, and supports isochronous mode for deterministic data exchange with the controller.
The module measures 15 mm wide, 73 mm high, and 58 mm deep, fitting a standard DIN-rail mount in an ET 200SP or S7-1200 system. It accepts unshielded or shielded cables up to 500 m (shielded max.), and the differential input architecture rejects common-mode noise on long runs.
Diagnostics and configuration
Onboard diagnostics include wire-break, short-circuit, group error, diagnostic alarm, limit value alarm (two upper and two lower per channel), overflow/underflow detection, and a channel status display via green LED. A green/red DIAG LED reports module-level diagnostics, and a red LED per channel indicates channel faults. The module uses a Sigma Delta measurement principle with a programmable notch filter (0.1 to 1000 Hz) and filter quality (5.00 to 250.00), plus an average value filter adjustable from 0.1 to 655.3 ms. It supports automatic encoding and firmware updates (current version V1.0.1). Isolation is tested at 707 V DC (type test), and the module draws 60 mA per channel from the backplane bus.
The part is classified as mature in its lifecycle. It is not marked as MSI (Manufacturer Shortage Indicator), meaning no active shortage flag from Siemens.