Silicon Labs has introduced the industry’s first high-speed, multi-channel digital isolators designed to meet the demands of programmable logic controller (PLC) applications.
The new Si838x PLC field input isolator family offers up to 2 Mbps, up to eight channels per device, bipolar input flexibility, high noise immunity and 2,5 kVRMS safety isolation.
The Si838x family provides a purpose-built solution for PLC applications including industrial I/O modules, computer numerical control (CNC) machines and servo motor control. They are also ideal for process automation controllers (PACs) used in distributed process control systems.
Widely deployed in harsh factory floor environments, PLCs must be robust and compact. Many PLC designs scale up to 128 channels and have multiple high-speed inputs. While optocouplers have provided the default isolation solution for decades, they present major challenges to PLC designers. Lacking high-speed capabilities, optos are not fast enough for high-performance PLC applications such as servo motor control.
They also lack high noise immunity, and their performance degrades over time and temperature, posing reliability risks in high-temperature industrial applications. The Si838x family addresses these challenges by providing a flexible, high-speed, multi-channel bipolar isolation solution in a compact QSOP package with a longer service life and higher reliability than opto-based solutions.
Si838x isolators provide eight channels of 24 V digital field interface. By daisy chaining 16 of them in a system design, developers can create PLCs with up to 128 channels supported by a single serial peripheral interface (SPI) port on the system’s embedded processor.
The controller interface can be eight parallel channels or a four-port SPI. Developers can configure the SPI for on-the-fly programming for custom de-bounce of noisy signals and for daisy chaining to support high-channel-density PLC designs. An optional de-bounce filter is either pre-programmed in a parallel configuration or programmable in a serial-out configuration.
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