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Hirschmann MM20-Z6Z6Z6Z6SBH
Hirschmann MM20-Z6Z6Z6Z6SBH

MDB MLSI-DR11-W

Product Series:​ MDB MLSI Series — legacy-compatible interface / modern DIN-rail I/O variant
Product Brief:​ Compact DIN-rail mounted digital input/output and relay interface used for machine panel control, OEM equipment integration, or as a modern replacement/adaptation of classic DEC DR11-W parallel I/O concepts in industrial cabinets. Provides optically isolated 24 VDC digital inputs and relay contact outputs (SPST/SPDT per variant) for low-voltage load switching.
Category:
Description
Function / Working Principle:​ Digital inputs are opto-isolated 24 VDC; when activated they close corresponding internal logic which can drive relay coils or be read by connected controller. Relay outputs provide dry contacts to switch field devices (pilot lamps, solenoid valves, small contactors). Some variants support dry-contact wiring to PLC digital cards or external monitoring via RS-485/Modbus gateway.
Supply Voltage:​ 24 V DC nominal​ (operating range 18 V DC – 30 V DC); internal consumption low
Input Type:​ 24 V DC digital inputs, optically isolated (exact channel count dependent on sub-variant; typically 8–16 DI)
Output Type:​ Electromechanical relay outputs, SPST or SPDT (Form C), rated for low-voltage DC/AC control circuits
Input-to-Output Isolation:​ Galvanic isolation between input side and relay contact side to reduce noise coupling from inductive loads
Communication / Interface:​ Dry-contact I/O; optional pairing with Modbus/RS-485 gateway in cabinet for supervisory monitoring
Dimensions (Typical):​ ≈ 120 mm (H) × 25 mm (W) × 75 mm (D)
Weight:​ ≈ 0.15 kg
Mounting Method:​ 35 mm DIN rail (EN 60715), front-wired screw terminals or push-in terminals; IP20​ (indoor panel use only)
Operating Temperature:​ –10 °C to +55 °C
Humidity:​ 5 % – 95 % RH, non-condensing
Status Indication:​ Per-channel LEDs for input activation and relay energized state
Enclosure Material:​ Flame-retardant thermoplastic (UL94V-0 typical)
Applicable Industries:​ Machine tool retrofits, legacy computer-peripheral interfacing (PDP-11/Unibus emulation contexts), OEM special machinery, test benches, packaging lines control panels
Installation Requirements:​ Mount on 35 mm DIN rail inside enclosed control panel; allow clearance for heat dissipation from relay coils; separate low-voltage signal wiring from high-current power cables.
Usage Notes:​ Verify relay contact rating matches load (especially inductive loads — use flyback diode or snubber); do not exceed max switching voltage/current on relay contacts; if used in legacy Unibus context confirm jumper/switchpack settings match host address/vector assignments per DEC DR11-W documentation.
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