The PLC 1785-L20E is a PLC5 processor. This module is a major component of the legacy PLC5 product category. This controller is a single slot module that is compatible with 1771-A1B, -A2B, A3B, -A3B1, or the -A4B chassis. This controller is ideal for use medium range automation requirements as it supports a total of 512 I/O (mixed) and 512 input / output (complementary).
The 1785-L20E has a built-in volatile memory that amounts to 16KWords, which is maintained by a Lithium battery with catalog number 1785-XYC. This battery provides the necessary energy to maintain the contents of the controller’s SRAM to allow the controller to continuously function. For backup and increased system availability, non-volatile memory back up devices may be installed such as 1785-ME16 with 16Kwords, 1785-ME32 with 32Kwords, 1785-ME64 with 64 Kwords and 1785-ME100 with 100Kwords.
The 1785-L20E’s embedded communication interfaces include One (1) DH+ dedicated interface, One (1) DH+/Remote I/O (Adapter or Scanner) combination interface, One (1) serial port that supports RS-232, 423 and RS-422A standards and One (1) Ethernet channel that supports 10/100 Mbps transmission speed.
