Product Description:

The VT-SR2-1X/1/SO43A-1608 is a plug-in control module from Bosch Rexroth Indramat that belongs to the VT-SWMA Modules series. It mounts in a standardized rack and conditions command signals while driving internal relay circuitry, allowing a central control system to actuate or monitor field devices without adding separate power rails. By combining a regulated supply section with fast relay outputs, the card supports precise hydraulic or motion control loops in automated machinery. This arrangement lets a single rack slot handle signal processing and relay switching in the same assembly.

The module operates from a symmetrical supply of ±24 VDC, which is the nominal voltage required on the backplane for stable operation. Undervoltage tolerance extends down to ±22 VDC, meaning the card stays active during brief power dips, while the upper limit of ±28 VDC protects components against moderate overvoltage conditions. Maximum current draw is limited to 150 mA, a figure that indicates power-supply demand and thermal loading. The analog command channel presents an input resistance of 50 kΩ, so connected signal sources experience only minimal loading and can maintain accurate reference levels.

Internally, the board generates a regulated auxiliary rail of ±15 VDC that supplies external transducers or onboard op-amps without additional converters. Each relay coil is wound to 700 Ω, a resistance that sets coil current and supports reliable pull-in at the specified control voltage. Relay contacts react within 4 ms, providing fast but predictable switching suitable for closed-loop tasks. This response supports repeatable sequencing between the control signal and the switched field circuit. Field wiring is handled through a single 32-pin DIN 41612 Form D connector, which consolidates power, inputs, outputs, and reference lines into one standardized interface.