Siemens 6ES5318-8MC12 Interface Module

Engineered for SIMATIC S5 Network Communication

This module manages data exchange between S5 CPUs and external devices. It provides reliable serial communication for the Siemens 6ES5318-8MC12 unit. You will find this interface card in the SIMATIC S5 series. Unlike basic communication modules, this version supports multiple protocols. It handles both point-to-point and multi-drop network configurations.

Technical Specifications & Physical Dimensions

We designed this interface module for industrial data exchange. The table below presents all verified technical specifications.

Parameter	Specification
Physical Dimensions (W x H x D)	160mm x 125mm x 50mm
Total Weight	0.65 kg (650 grams)
Communication Ports	2 serial interfaces (configurable)
Supported Protocols	RS232, RS422, RS485 (selectable)
Baud Rate Range	300 to 9600 baud
Operating Voltage	5V DC (from backplane)
Component Count	2 driver ICs, 1 microcontroller, 4 optocouplers

Functional Architecture and Port Configuration

This interface module connects to printers, host computers, or other PLCs. It uses two independently configurable serial ports for flexible wiring. You can set each port for different baud rates and protocols. Moreover, the module includes a dedicated communication microcontroller. This component handles all message formatting without CPU intervention. Consequently, the main processor focuses on control tasks rather than serial data handling.

Installation and Operational Guidelines

The Siemens 6ES5318-8MC12 buffers up to 256 bytes of transmit data. It provides 500V isolation between the backplane and field ports. You must set the DIP switches for the correct protocol. Always use terminated cables for RS485 networks longer than 100 meters. This practice prevents signal reflections and data corruption. Furthermore, the module supports ASCII and 3964R protocols. This feature matches various third-party device requirements.

Physical Characteristics and Environmental Limits

This interface module has a rugged, industrial-grade plastic housing. Its substantial 0.65 kg weight reflects the dual-port design quality. The layout follows Siemens standard S5 module specifications. Therefore, it fits securely into any SIMATIC S5 rack. The module requires one slot width for installation. In addition, it maintains stable operation between 0°C and 60°C ambient temperature. You can store this unit safely between -40°C and 85°C.