The TXM-315-LC is a part of the LNX series of industrial programmable logic controllers (PLCs) designed and manufactured by SIEMENS. It is a Micro PLC, 3 I/O Expansion Unites, with 24Vdc Digital Inputs and 24Vdc Digital Outputs. It features up to 2,500 steps of user ladder program and up to 100 additional instruction blocks. It has built-in RS232 for programming, run time monitoring and remote system monitoring, and the ability to communicate via external devices such as Modbus, and Profibus. The TXM-315-LC is ideal for applications such as monitoring, control and automation, where a cost-effective solution with high reliability is essential.