SIEMENS SIMATIC RF120C Communication Module Comprehensive Analysis and Application Guide

Siemens SIMATIC RF120C Communication Module Comprehensive Analysis and Application Guide

Introduction

RFID technology plays an increasingly important role in industrial automation and logistics identification systems. The Siemens SIMATIC RF120C communication module serves as a dedicated extension module for the SIMATIC S7-1200 controller, enabling efficient integration and data exchange of RFID readers. This article is based on official operating instructions and systematically reviews the technical characteristics, installation configuration, parameter settings, programming methods, and maintenance diagnosis of RF120C, providing a complete technical reference for project implementation and system maintenance.

Product Overview and Functional Features

1.1 Application Fields

The SIMATIC RF120C communication module is designed specifically for the SIMATIC S7-1200 controller and is suitable for various industrial identification scenarios, such as material tracking, warehouse management, production line control, etc. The module supports connecting a single RFID reader or optical reader through the RS422 interface and is compatible with the following device series:

RF200, RF300, RF600 (including RF620R/RF630R)

MV400/MV500 optical reader

MOBY D/U recognition system

1.2 Core Functions

Physical addressing support: Supports direct physical addressing of the responder, also known as standard addressing.

Multi module expansion: A S7-1200 controller can run up to three RF120C modules simultaneously.

Integrated configuration: Implement hardware configuration and parameter allocation through TIA Portal, without the need to separately configure reader parameters in the program.

Protection level: IP20, suitable for installation inside control cabinets.

Standard cable support: Provides pre installed cables of 2m, 5m, 10m, etc. to simplify on-site wiring.

Installation and hardware connection

2.1 Installation prerequisites

Only qualified professionals are allowed to operate, ensuring compliance with safety regulations.

The equipment must operate at Safety Extra Low Voltage (SELV) and the power supply must comply with IEC 60950-1 standard.

2.2 Installation steps

Disconnect the power and remove the bus cover on the left side of the CPU.

Align RF120C with the CPU bus connector and insert it until the buckle is locked.

Install the assembled module onto a 35mm DIN rail.

Connect the 24V DC external power supply to the top 3-pin terminal (L+, M, ground) of the module.

Use a D-type connecting cable (9-pin) to connect the reader to RF120C.

Connect the power, close the module front cover, and complete the hardware installation.

2.3 Electrical Connection Instructions

Power input: 24V DC, maximum current 1A, used to power the reader.

Communication interface: 9-pin D-type socket, supporting RS422 communication, with a maximum cable length of up to 1000m (depending on the reader type).

Backplane bus power supply: The module itself is powered through the S7-1200 backplane bus, without the need for external auxiliary power supply.

Software configuration and parameter settings

3.1 Integrated Development Environment

Since STEP 7 Basic/Professional V13, RF120C has been integrated into TIA Portal. Users can complete the configuration through the following steps:

Add S7-1200 devices to the TIA Portal project.

Select "Communication Module>Identification System>RF120C" from the hardware directory and drag it into the device view.

Set parameters in the module properties and download them to the controller.

3.2 Key parameter group

(1) Reader parameter group

Diagnostic message: The error reporting mechanism can be defined by selecting levels such as "none" and "hard error".

User mode: Usually select 'Ident profile' to use standard function blocks.

Ident device/system: Select based on the actual connected reader type, such as RF300 regular, RF600, MOBY U, etc.

(2) Ident device/system parameter group

Transfer speed: Supports 19.2 kBd, 57.6 kBd, 115.2 kBd, and needs to be consistent with the reader settings.

RF power: Adjustable reader transmission power (e.g. RF380R supports 0.50-2.00W).

Existence check: Control whether to monitor the real-time entry of the transponder into the antenna field.

Distance limit: Set the effective recognition distance of the reader (0.2-3.5m).

BERO mode: used for sensor synchronous control of antenna field switches.

(3) Reader type parameter group (RF600 series only)

Wireless configuration files: ETSI, FCC, or CMIIT.

Multi label mode: supports UID as EPC-ID or Handle-ID.

Transmission power adjustment: The antenna output can be precisely controlled through hexadecimal values.

Programming and Addressing of Answerers

4.1 Function Block Support

RF120C provides a complete Ident function block library, including:

Read、Write

Read_EPC-ID、Write_EPC-ID

Set_Sent (antenna control)

Reset-Reader (Reader Reset)

AdvancedCmd (Advanced Command)

These blocks are called through Ident configuration files and support cyclic and non cyclic data exchange.

4.2 Detailed explanation of addressing for sending responders

RF120C supports linear addressing, and the address range varies depending on the type of responder being sent