4 Chapter 2 Product Introduction
EC20 Series PLC User Manual
2.11 Multiple Password Protection Function
The product provides three password authorities, which is convenient for user program access control and protecting
the intelligence property.
2.12 Expansion Module
The expansion module such as I/O module, analog signal input/output module, network expansion module, and
position control module can be connected to the PLC main module. Every module is address allocation automatically
and identification automatically.
2.13 RUN And STOP Control
RUN or STOP of the EC20 can be controlled through the following methods: the RUN/STOP switch, ControlStar
program system, communication port (i.e. Modbus), and standard input ports X0~X7, which are convenient for
controlling system operation
2.14 User Program Developing And Debugging
Provide the integrated ControlStar program system compatible with IEC61131-3 standard, and uses ladder diagram,
instruction list, and sequential function diagram to program. The unit has such functions as monitoring, debugging,
and modifying on-line. The program system also provides strong instruction guide and on-line help.
2.15 Communication And Networking
The main module has two asynchronism serial communication ports (COM1 provides RS232 and RS485 level), for
communication with personnel computer, HMI and other equipment; and the main module has an inner standard
Modbus protocol to compose 1:N network; and supports freedom protocol.
Provide Profibus module to compose the Profibus network.
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