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What is BENTLY 3500/15 power module? 

The 3500/15 is available in both AC and DC forms and is compatible with voltage sources around the world. It adopts row noise filtering as the standard form.

Single power supply or redundant dual power supply can be used in the framework when power interruption is not allowed

The 3500/15 AC and DC power supplies are half height modules and must be installed in the designated slots on the left side of the rack. The 3500 rack can contain one or two power sources providing any combination of AC and DC. Any power source can supply power to the entire rack. When two power supplies are installed in the rack, the lower slot is used as the main power supply, and the other slot is located in the upper slot as a backup power supply. If installed, the second power source is a backup power source for the main power source.

3500/15 AC and DC power supply can accept a wide range and convert it into acceptable voltage
For use by other 3500 modules.

System:
Universal AC power supply
High voltage DC power supply
Low voltage DC power supply
The universal AC power supply and PIM (power input module) are not compatible with traditional 3500 AC power supply, high-voltage AC PIM, and low-voltage voltage AC PIM.
High voltage and low voltage DC power supply
The power supply and PIM (power input module) are not available
Compared to traditional 3500 high-voltage and low-voltage DC power supplies and PIM.

PLC, short for Programmable Logic Controller, is a digital operational electronic system specifically designed for use in industrial environments. ‌1

PLC uses programmable memory to store instructions for performing logical operations, sequential control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production processes through digital or analog input and output. It has the characteristics of reliable operation and programmability, and is widely used in the field of industrial automation.

PLC has multiple classification methods:

1. Classified by structural form:

Integrated PLC: The power supply, CPU, I/O interface and other components are centralized in one chassis, with a compact structure, suitable for small PLCs.
Modular PLC: divides each component into multiple modules, such as CPU module, I/O module, etc., suitable for large and medium-sized PLCs, easy to expand and maintain.

2. Classified by function:

Low end PLC: It has basic logic operation, timing, counting and other functions.
Mid range PLC: equipped with analog input/output, remote I/O and other functions.
High end PLC: It has functions such as complex calculations and large-scale process control.

3. Classified by I/O points:

Small PLC: I/O points less than 256.
Medium sized PLC: The number of I/O points ranges from 256 to 2048.
Large PLC: I/O points greater than 2048.

How does a safety instrumented system work? 

What is a safety instrumented system? 

A safety instrumented system is often the last line of defense before a hazardous event occurs at a plant or operation. A SIS is composed of logic solvers, sensors, and final elements. These systems detect “out of control” process conditions that could lead to an unwanted incident, and then automatically return the process to a safe state. But it’s important to remember that safety instrumented systems (SIS) are different from process control systems.

Safety systems are applied across many industries. Emergency shutdown systems and fire and gas detection are among the most common applications. But there are other areas where a SIS can help protect workers and operations such as:

• Burner management
• Turbomachinery control and protection
• High integrity pressure protection