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Compact grey industrial IO module with terminal blocks and DIN rail clips, 15 by 10 by 5 cm

PUSR

PUSR 4AI 4AO IO Extender USR-IO0404 Factory Integration

SKU CH-FXZK-BAX5G

A modular I/O controller with four analogue inputs and four analogue outputs, using RS-485 and Modbus RTU, DIN-rail or wall mounted.

  • Size/Dimensions15 cm x 10 cm x 5 cm
  • Standard Modbus RTU simplifies system integration
  • Hardware watchdog ensures reliable operation
  • EMC Level 3 IEC 61000 protects against interference
  • Wide -25 to +75 °C operating range
  • Flame-retardant V0 rating enhances safety

Industrial IO Extender for Automation Systems

The PUSR USR-IO0404 is a modular IO controller that provides four analogue inputs and four analogue outputs in a compact 15 cm by 10 cm by 5 cm housing. It connects over a standard RS485 interface using the Modbus RTU protocol for straightforward integration into existing control networks. Industrial grade construction includes EMC protection to IEC 61000 Level 3 and a hardware watchdog for reliable continuous operation. The unit operates across a wide temperature range from -25 to +75 degrees Celsius.

Suited for Retrofits and Distributed Monitoring

This module fits engineers adding sensor or actuator points to legacy PLCs without rewiring the main cabinet, and it serves panel builders who need DIN rail or wall mounting in tight enclosures. The V0 flame retardant rating supports safety compliance in hazardous areas. Buyers who require digital IO channels, higher channel counts, or wireless connectivity such as 802.11b should look at other models in the PUSR range. The single-band wireless spec at 40 GHz limits use to specific access point configurations.

Deciding Specification — Four Analogue In

The defining feature is the fixed 4AI 4AO channel configuration, which determines whether the module matches the signal count of your application. If the process demands more analogue points or a mix of digital signals, this unit will not meet the requirement. All other capabilities — Modbus RTU, RS485, watchdog, EMC Level 3, and the extended temperature rating — support that core analogue function. Confirm the exact channel tally before ordering.

Highlights

  • Standard Modbus RTU simplifies system integration
  • Hardware watchdog ensures reliable operation
  • EMC Level 3 IEC 61000 protects against interference
  • Wide -25 to +75 °C operating range
  • Flame-retardant V0 rating enhances safety

Specifications

BrandPUSR
Size/Dimensions15 cm x 10 cm x 5 cm

Questions about this item

How often does the hardware watchdog need checking on the USR-IO0404?

The built-in hardware watchdog runs automatically to reset the module if firmware stalls, so no scheduled maintenance is required for the watchdog itself.

Which limit appears first during continuous Modbus RTU polling on the RS-485 bus?

The RS-485 interface and Modbus RTU protocol set the communication bandwidth ceiling before thermal limits are reached at the rated 75 °C maximum.

What noise, heat or power impact should I expect when the module operates all day in a cabinet?

Silent solid-state operation with no fan; the unit is rated for -25 °C to +75 °C ambient and meets EMC Level 3 per IEC 61000, so heat stays within industrial limits.

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