Moore Industries-Pacific ’ safety trip alarms for IEC 61508 safety applications is now featured as a logic solver in exida’s exSILentia integrated safety lifecycle software. The exSILentia software is a safety lifecycle engineering tool.
Safety trip alarms are part of the FS functional safety series and work as a logic solver and act on potentially hazardous process conditions. Safety trip alarms warn of unwanted process conditions and provides emergency shutdown or on/off control in safety instrumented systems (SIS) and traditional alarm trip applications.
By including safety trip alarms in the exSILentia software tool, exida has given competent functional safety practitioners a way to determine the alarm’s applicability in specific safety-related applications.
Exida is selective in choosing components for exSILentia’s equipment database. Functional Safety experts at exida had to review and approve all failure modes, effects, and diagnostic analysis (FMEDA) data to include the safety trip alarm. With the exSILentia tool, safety practitioners can select the 4-wire (line/mains-powered) safety trip alarms as an economical Logic Solver that accepts a signal input from transmitters (current and voltage inputs), resistance and potentiometer devices, temperature sensors and more.
Safety trip alarms can be configured for a wide variety of safety instrumented functions (SIF) for safety related applications. The “high availability” alarm trip is designed for Safety Instrumented Systems up to SIL 2 and the firmware is suitable for use in a SIL 3 system, in a 1oo2 (one out of two) voting architecture.
The safety trip alarm provides three failsafe alarm signals, two of which are configurable process alarms that trip when a monitored process variable falls outside of user-set high and low limits. The third alarm is a non-programmable, latching alarm that is activated if any internal faults are found by the STA’s extensive internal diagnostics. If the input is faulty or broken this fault relay is also triggered.
The safety trip alarm features standard “transmitter excitation” that provides 24V power to a 2-wire transmitter as well as:
- 20-bit input resolution
- Long term stability of up to 5 years between scheduled calibrations
- Rugged, industrial metal housing
- Isolation and RFI/EMI protection that provides superior protection against the effects of ground loops, plant noise, and radio frequency and electromagnetic interference