Description
‑ Power Supply：24VDC，operating range 19.2‑30VDC
‑ Mechanical Structure：DIN‑rail installation rack unit；overall weight approx 0.75kg
‑ On‑board Resources：Built‑in backplane internal bus circuit, module slot positions, power distribution circuit; no processor, no memory.
‑ Communication Interface：Internal ModuleBus backplane bus for S800 I/O modules; external connect to IM/CI interface module.
‑ Galvanic Isolation：Field side isolation depends on paired I/O modules.
‑ Core Function：Mechanical installation carrier for S800 I/O modules, back‑plane bus signal transmission, power distribution for I/O modules.
‑ Protection：Over‑current protection for power input.
‑ Status LED Indicators：Power status indicator LED.
‑ Weight：approx 0.75kg
‑ IEMMU21 is S800 I/O mounting rack, install on standard DIN‑rail. Multiple S800 I/O modules can be inserted into its slots. It transmits ModuleBus signal and distributes 24V working power to each inserted I/O module.
‑ Cooperate with communication interface modules such as CI801, CI810B etc, realize data exchange between S800 I/O station and AC800M controller. Support digital input, digital output, analog input, analog output S800 I/O modules.
‑ The backplane bus realizes data interaction among each I/O module, the mounting unit itself does not execute logic program, all logic runs in upper‑level CPU controller.
‑ Must match S800 series I/O modules; cannot mix with other series I/O modules. Terminal units are required for field signal wiring.
Difference compared with IEMMU11：IEMMU21 supports more I/O module slots, larger station capacity for S800 I/O station.
‑ Monitor input power supply status of the mounting unit, power indicator shows working state.
‑ No local data processing function; all channel diagnosis information comes from inserted I/O modules and uploaded to AC800M controller.
‑ Damage of mounting unit will cause whole station I/O communication failure.
‑ Back‑plane：Internal ModuleBus back‑plane for inserted I/O modules.
‑ External interfaces：24VDC power input terminal, ModuleBus communication connecting port for interface module.
‑ Mounting：Standard DIN‑rail installation
‑ Operating Temperature：0 ℃ ~ +55 ℃
‑ Storage Temperature：‑40 ℃ ~ +70 ℃
‑ Relative Humidity：5‑95 %RH, non‑condensing
‑ Pollution degree：Degree 2
‑ Protection Class：IP20, cabinet‑internal installation.
- IEMMU21 module mounting unit（3BSE008552R1）
Complementary parts: 24VDC power supply, S800 series I/O modules, CI series communication interface module, terminal wiring units, ModuleBus connecting cable, System 800xA controller.
‑ Mount on standard DIN‑rail, ensure reliable locking. Power supply wiring should comply with cabinet power distribution specification.
‑ ModuleBus communication cable wiring shall follow installation requirements, avoid strong‑electromagnetic interference area.
‑ When inserting I/O modules, power‑off operation is recommended. Confirm module type matches IEMMU21, incompatible modules cannot be inserted.
‑ For spare‑part replacement: verify full model IEMMU21 and part‑number 3BSE008552R1. After replacement, check power indicator and whole station I/O communication status.
Power plant, petrochemical, paper‑making industry 800xA DCS control cabinets; S800 I/O station rack carrier; industrial spare‑part for ABB S800 I/O system.
- ABB S800 I/O IEMMU21 module mounting unit (3BSE008552R1), DIN‑rail mounted rack base for S800 I/O modules.
- Integrates ModuleBus back‑plane bus and power distribution circuit, provides bus signal and working power for inserted I/O modules.
- Work with CI series interface modules to build complete S800 remote I/O station.
- DIN‑rail slide‑lock installation structure, IP20 protection for cabinet inside use.
- Compatible with full range S800 digital & analog I/O modules, no self‑logic processing function.
- Mature discontinued DCS spare‑part, only applied for old‑system maintenance and retrofit projects。
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