Reading out UID with SIMATIC RF1070R
Article ID: 109780625, V1.0, 09/2020
1 Introduction
1.1 Overview
Starting point
Companies have been using RFID-based identification card systems for many
years to control access to buildings. The growing need for security and increasing
requirements for documentation call for solutions that can control access to
machines and equipment on a user-specific basis. The SIMATIC
RF1040R/RF1070R readers provide the option of using employee identification
cards even when operating machines. This allows finely graded access concepts to
be implemented or user-specific instructions to be stored - all with one card.
Requirement
A reader at the entrance to a company's factory must read the serial number (UID)
of a card and transmit to a SIMATIC S7 station via the communication interface of
the automation system. You can then use this UID to implement conditions for
access authorization or sharing on a machine in the S7 program.
The following figure provides an overview of the automation task.
Figure 1-1
Use case
• Use of a compact controller from the S7-1200 series
• Transmit the UID from the SIMATIC RF1070R reader to the
SIMATIC S7 CPU via the CM1241 RS232 communication module.
Solution approach
The RF1070R reader can be linked to a SIMATIC S7-1200 CPU using the CM1241
RS232 communication module. With this link, communication happens over the
Freeport protocol. The Freeport protocol offers the ability to communicate directly
with the reader.
The RF1040R/RF1070R reader has two interfaces:
• USB
• RS232 serial interface
Only the RS232 serial interface is required for this application example. The USB
interface can be ignored.
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