Designing An Sif Using The Llt100 - ABB LLT100 Functional Safety Manual

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C h A P T E R 3

Designing an SIF using the LLT100

Figure 1 shows a safety function example with the LLT100. The vessel level is monitored by the laser
level transmitter. The LLT100 4–20 mA output loop is proportional to the level, ullage or volume of the
vessel. Configuration of the LLT100 can be performed directly on its HMI or with HART communication
protocol through a computer or handheld terminal. The LLT100 connects to the user logic device to
control one or multiple actuators for process control and SIF.
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Figure 1
Safety function with LLT100 monitoring a vessel and user logic controlling it
Number Description
1 LLT100
2 Computer with FDT and LLT100 DTM
3 hArT FSK modem
handheld terminal
4
Automation system, Logic-unit, pLC or other logic device
5
6 Actuator