Helmholz 700‑872‑MDM02

Product Name: REX300 Analog Modem Remote Access Router Product Description: Obsolete‑generation industrial remote‑access router from Helmholz REX300 series, equipped with analog telephone modem, PROFIBUS / MPI interface and serial port. It establishes remote maintenance connection to PROFIBUS‑based automation systems over analog PSTN telephone network for remote diagnosis, program upload and download of PLC stationstiendahelm…

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Description

Technical Specifications

  • Power Supply: 24 V DC
  • Interface: PROFIBUS‑MPI, RS232 serial, analog telephone line interface
  • Operating Temperature: ‑40 °C ~ +70 °C
  • Mounting: DIN‑rail mounting
  • Modem Standard: Analog PSTN V.34 Function Features
  • Remote access to PROFIBUS‑MPI PLC via analog telephone line
  • Supports remote programming, diagnosis and status monitoring for S7‑300 / S7‑400 controllers
  • Built‑in access password security mechanism
  • Status LED indicators for link, power and communication activity
  • DIN‑rail compact housing for cabinet installation Application Scenarios: Legacy industrial field equipment remote maintenance, distributed plant automation sites without Ethernet infrastructure, retrofitted PROFIBUS‑based machinery remote troubleshooting. Performance Parameters: Analog modem connection speed up to 33.6 kbit/s; galvanic isolation for PROFIBUS‑MPI interface; dial‑in access permission control. Material Composition: Industrial‑grade ABS plastic DIN‑rail housing; isolated communication transceivers; analog modem chip‑set. Structural Characteristics: Compact vertical DIN‑rail form factor; front‑panel status LED array; terminal blocks for power supply; RJ‑11 telephone jack; PROFIBUS‑MPI circular connector. Working Principle: Establishes PSTN dial‑up connection with remote engineering station; converts serial telephone‑line data stream into PROFIBUS‑MPI protocol frames; transparently forwards PLC engineering commands and process data between local PLC and remote engineering PC. Installation Requirements: Mount on standard DIN‑rail inside control cabinet; connect stabilized 24 V DC power; connect analog PSTN telephone line; wire PROFIBUS‑MPI cable to target PLC MPI port. Usage Notes: This product is end‑of‑life, replaced by REX25 series LTE/WAN routers; ensure stable analog telephone line quality; configure access password to prevent unauthorized dial‑in access; avoid surge voltage on telephone‑line input.
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