EPM-S402 Lenze I/O System 1000 Two-Channel Analog Input Module

Product Snapshot

• EPM-S402 is a two-channel analog input module from Lenze.
  • It is part of the I/O System 1000 family.
  • Type: I/O compound module for the backplane bus.
  • Job: read current signals from sensors.
  • Signal range: 0 to 20 mA and 4 to 20 mA.
  • Key benefit: fast 2 ms conversion on both channels.
  • Key benefit: fine 12-bit resolution for stable readings.

Technical Data

• Brand
  • Lenze
• Model
  • EPM-S402
• Series
  • I/O System 1000 (EPM-Sxxx)
• Inputs
  • 2 analog current inputs
  • Range: 0 to +20 mA
  • Max input current before damage: 40 mA
  • Max input resistance: 110 Ω
  • Input data size: 4 bytes
• Accuracy and speed
  • Resolution: 12 bits
  • Basic conversion time: 2 ms for all channels
  • Measuring principle: successive approximation
• Wiring
  • Max shielded cable length: 200 m
• Ports and protocols
  • Built-in ports: none
  • Protocols: not applicable
  • Fieldbus comes from the EPM-S1xx bus coupler
  • No communication expansion
  • Mounts on the I/O System 1000 backplane bus
• Electrical
  • Supply: DC 24 V nominal (DC 20.4 to 28.8 V)
  • Power comes through the bus coupler backplane
  • Backplane current: 70 mA
  • Power loss: 0.7 W
  • Load voltage L+ draw: 15 mA typical, no load
• Temperature range
  • Operating: 0 to +60 °C
  • Valid for horizontal and vertical mounting
  • Per EN 61131-2
  • Storage temperature: not published by the maker
• Environmental tolerance
  • Humidity: non-condensing, no %RH figure published
  • Protection rating: not published (DIN-rail backplane module)
  • Shielded cable limits noise pickup in cabinets
• Physical
  • Size (H×W×D): 109 × 12.5 × 76.5 mm
  • Single-width housing
  • All EPM-S2xx to S6xx compound modules share this housing
  • Weight: not published by the maker
• Lifecycle
  • I/O System 1000 is an active Lenze line
  • Manual v7.1 is available from Lenze
  • Last verified: 2026-10
  • Audit status: OFFICIAL_VERIFIED

Install Guide

• Clip the module onto the DIN rail.
• Slide it next to the bus coupler.
• Press the backplane contacts together.
• Wire sensors to the current inputs.
• Use shielded cable. Keep runs under 200 m.
• Tie the shield to ground at one point.
• Feed L+ to two-wire sensors.
• Check the 24 V supply is in range.

Expert Review

• This module is simple and quick to use.
• Two channels in one 12.5 mm slot save rail space.
• 2 ms updates suit most pressure and flow loops.
• 12-bit steps are fine for common 4 to 20 mA sensors.
• 110 Ω input resistance keeps loop burden low.
• The 40 mA damage limit guards against wiring faults.
• No setup jumpers. The bus coupler handles the config.

Manager’s Insight

• One module type covers many sensor jobs.
• That means fewer spare part numbers in stock.
• Shared housing across the range cuts training time.
• Fast swaps mean short line stops.
• Active lifecycle protects long-term sourcing.
• Best fit: plants already using I/O System 1000.

Best Fit Devices and Applications

• Pressure transmitters with 4 to 20 mA output
• Flow meters on skid units
• Level probes in tanks
• Temperature transmitters with current output
• Valve position feedback
• Machine panels built on the I/O System 1000 bus coupler

FAQ

• Q: Do both channels update at the same time?
  • A: Yes. The 2 ms figure covers all channels together.
• Q: What happens if a sensor shorts out?
  • A: The input survives up to 40 mA. Above that, damage is possible.
• Q: Can I use long sensor cables?
  • A: Yes, up to 200 m with shielded cable. Ground the shield at one end.
• Q: From experience, what trips up first-time users?
  • A: Poor shielding. Most noise faults come from open shields or long unshielded tails.
• Q: How should I choose between this and other I/O modules?
  • A: Count your current sensors first. Buy one EPM-S402 per two channels. Keep one spare per panel. All units ship with a 12 month warranty. We dispatch in 12 to 24 hours by FedEx, UPS or DHL.

Contact

• Email: sales@powergearx.com
• WhatsApp: +86 18030005825
• Ask for stock and lead time before you order.

Legal

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• Original Source: https://www.powergearx.com/