Core functions and positioning
PLM 3900N is a critical control module in the Triconex Safety Instrumented System (SIS), whose core function is priority control logic:
Signal priority sorting: Prioritize automatic or manual instructions from different security levels
Actuator driver: drives pumps, valves, and other equipment in dedicated safety facilities and related support systems
Conflict prevention: Prevent conflicts between signals provided by multiple systems, ensuring that actuators perform their corresponding functions based on the correct signals
Power Management: As a power logic module, it provides a stable 24V DC power supply for the Tricon system and monitors the power status

Parameter
Product model PLM 3900N
Manufacturer Triconex (a brand under Schneider Electric)
Product type priority logic module/power logic module
Input voltage 24V DC or AC 220V
Output voltage 5V DC/24V DC
Working temperature -40 ° C to+70 ° C (some sources refer to -40 ° C to+85 ° C)
Safety level SIL 3 (IEC 61508)
Triple Modular Redundancy (TMR) architecture
The maximum number of channels is 32
Communication protocols Modbus TCP/IP, Modbus RTU, RS-485, Ethernet/IP
Protection level IP20 or IP65 (different versions)
Size 150 × 75 × 50 mm or 100 × 50 × 20 mm (different versions)
Weight 0.38kg -500g
Memory capacity 8MB
Response time<1ms
Installation method: Rack installation/DIN rail installation
Certified CE, UL, RoHS

Key Features
Triple Modular Redundancy (TMR): Adopting a two out of three voting mechanism to ensure safe operation of the system even in the event of a single point of failure
High reliability: no single point of failure design, MTBF exceeding 150000 hours, ensuring continuous operation of the system
Hot swappable support: supports online module replacement without downtime maintenance
Priority control: a prioritization system specifically designed to handle urgent or critical control tasks
Fault diagnosis: Built in powerful diagnostic function that can detect and report power and module faults

Application field
PLM 3900N is mainly used in scenarios that require extremely high security and availability:
Nuclear power industry: Safety grade instrumentation and control systems for nuclear power plants, driving dedicated safety facilities (ESFAS)
Oil and gas: ESD emergency shutdown system for offshore platforms, refineries, and pipeline monitoring
Chemical industry: reactor safety protection, high integrity pressure protection system (HIPPS)
Power industry: turbine overspeed protection, combustion management system (BMS)
Other: Safety critical fields such as pharmaceuticals, metallurgy, water treatment, etc

TRICONEX PLM 3900N｜Digital Input Module｜