Schneider Electric 140ESI06210 Programmable Logic Controller Module

The Schneider Electric 140ESI06210 is an ASCII serial interface module for the Modicon Quantum PLC family, providing a two-port RS232C serial link to connect the Quantum CPU with ASCII devices or other controllers. This asynchronous interface enables Modbus ASCII communications over both ports, with 19.2 kbps commonly used in Modbus ASCII configurations. Designed to drop into the Quantum backplane alongside the CPU and other I/O modules, the 140ESI06210 expands serial connectivity within the Quantum system and is documented by Schneider Electric as the ASCII Interface Module for Quantum (140ESI06210). Hardware references illustrate the ESI06210 component as the ASCII interface module used in the Quantum architecture.