The ABB IMDSM04 (also identified as IMDSM-04) is a high-precision Pulse Input Slave Module designed for the Symphony Plus and Harmony Rack (INFI 90) distributed control systems. This module is engineered to capture high-speed frequency and pulse signals from critical field devices, including turbine flow meters, tachometers, and quadrature encoders. By utilizing four independent channels equipped with 32-bit hardware counters, the IMDSM04 delivers accurate measurement of speed, flow, and displacement. Its robust optical isolation and flexible voltage range (5–24 VDC) make it a staple in power generation and petrochemical industries where signal integrity and high-speed acquisition (up to 1 MHz) are essential.
The functional and electrical parameters for the IMDSM04 are detailed below:
| Parameter | Specification Details |
| Model Number | IMDSM04 (Order No: IMDSM-04) |
| Manufacturer | ABB (Symphony Plus / Harmony Series) |
| Product Type | Pulse Input Slave Module |
| Input Channels | 4 Independent Channels |
| Input Voltage Range | 5 VDC to 24 VDC |
| Maximum Frequency | Up to 1 MHz per channel |
| Counter Resolution | 32-bit Hardware Counter |
| Trigger Modes | Rising Edge, Falling Edge, Dual Edge |
| Isolation | 2500 V Optical Isolation (Channel-to-Channel/Logic) |
| Encoder Support | Quadrature Encoders (A/B/Z Phase) |
| Current Consumption | 80 mA @ 24 VDC (Backplane Load up to 1.5A peak) |
| Operating Temp | -20 °C to +70 °C (-4 °F to 158 °F) |
| Weight | 476 g (Unit) / 0.57 lbs |
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