PLC-5-20E

The Allen-Bradley PLC-5-20E is an Ethernet PLC-5 Processor. It has embedded TCP/IP communication that offers high-performance peer-to-peer communication. Its built-in web capabilities provide web diagnostics, module information, user-provided pages, and Domain Name Service (DNS). For communication, it has 1 Ethernet port, 1 DH+ port (fixed), 1 DH+ or Remote I/O (Adapter or Scanner) port, and 1 serial port configurable for RS-232 / RS-423 / RS-422A. The PLC-5-20E uses ladder-logic and structured-text programming with advanced instruction set including sequencer, file-handling, diagnostic, immediate I/O, shift register, and program control instructions. It is used in applications with real-time sequential and regulatory control requirements. The PLC-5-20E processor has maximum user memory of 16K words. It has up to 512 total I/O (any number of these I/O can be inputs or outputs) with 512 complementary inputs and outputs. It has 4 (0 – 3) I/O rack for I/O addressing. It has an I/O scan time per rack of 10ms at 57.6 kb/s, 7ms at 115.2 kb/s and 3ms at 230.4 kb/s. The PLC-5-20E requires a backplane current of 3.6A at 5V and has a maximum power dissipation of 19W. It also contains a battery-backed static RAM with EEPROM program backup. It is installed in the left-most slot of the 1771 I/O chassis and requires one slot. The PLC-5-20E processor has global status flags and input interrupts. It has programmable fault response diagnostics which prevent system failure by reacting to the faults. It allows for segregation of tasks controlled by multiple main programs. The PLC-5-20E examines certain information at specific time intervals with the time interrupt routine.