HIMA X-DO3251 Digital Output Module
The HIMA X-DO3251 is a high-density, safety-certified Digital Output (DO) module designed for the HIMax series of Programmable Electronic Systems (PES) by HIMA Paul Hildebrandt GmbH. It is used to drive actuators and execute control commands in Safety Instrumented Systems (SIS), ensuring safe and reliable operation in critical process and factory automation environments.
Key Technical Specifications
Module Type
Digital Output (DO)
Provides binary (On/Off) signals to control field actuators.
System
HIMax PES
Part of HIMA's high-availability, safety-certified PLC platform.
Safety Integrity Level (SIL)
SIL 3
Certified according to IEC 61508, suitable for the highest level of functional safety.
Number of Channels
32
Provides 32 individually controllable digital output channels.
Output Voltage
24 VDC
Used to directly switch 24 VDC field devices.
Output Type
High-Side Switch
Channels typically switch the positive (high) side of the load power supply.
Diagnostic Capabilities
Yes (Built-in)
Features extensive diagnostics, including detection of: load short-circuit, open-circuit (wire break), and cross-circuit faults.
Channel Current
Typically 0.5 A per channel
Maximum current limit per channel, designed to safely drive solenoids and contactor coils.
System Connection
HIMA System Connector (96-pin)
Connects to the HIMax backplane and Field Termination Assemblies (FTAs).
Function and Application
The X-DO3251 is used to implement the safety logic's commands by controlling field actuators in critical applications, such as:
Emergency Shut Down (ESD) Systems: Controlling solenoid valves to shut down processes or vent pressure.
Fire & Gas (F&G) Systems: Actuating alarm horns, flashing lights, and specialized suppression systems.
Safety Interlocks: Controlling contactors or relays to safely start or stop motors and pumps.
Key Advantages of the X-DO3251
High Density: 32 channels maximize the use of cabinet space, which is essential for large-scale safety systems.
High Diagnostic Coverage: The advanced built-in diagnostics continuously monitor the output wiring and load status. This allows the system to quickly detect and report faults, ensuring the output can reliably move to a safe state when commanded, thus maintaining SIL 3 compliance.
High Reliability: Designed for fail-safe operation and low Mean Time To Failure (MTTF), characteristic of the HIMax platform.
Associated Termination Boards
Like the DI module, the X-DO3251 requires a Termination Board (FTA) for field wiring connection. A compatible board might be:
HiCTB32-HIM-RAC-SP-DO3251: A termination board designed for the X-DO3251, facilitating orderly field wiring and connection to the HIMax backplane.
