Most of the manufacturers offering combination of a textpanel and a PLC have a single processor which controls the operation of the PLC as well as textpanel. Typically it contains a single power supply for both PLC and HMI functions. In these integrated units, inputs and outputs are usually fixed. A single processor Text Panel / PLC combination will inevitably decrease the performance of the system. Fixed I/O also limits the use of such products.
EZSeries TextPLC has dual processors, separate 32 bit coldfire 40 mhz RISC processors for PLC and 8 bit Processor for Text panel. These CPU's increase the performance and reliability of the EZSeries TextPLC. Most of the vendors manufacturing integrated Text Panel and PLC have only 1 power supply unit which makes their system less reliable, where as EZSeries TextPLC has separate power supplies for both Text Panel and PLC. This feature enhances the reliability of this combination product. Other integrated PLC and Text Panel products have fixed inputs and outputs, and limited expandability. EZSeries TextPLC I/O's are modular which gives the user a variety of options to design a good and an efficient system. If the user wants to expand his I/O's, it can be accomplished through built-in RS-485/RS-422 port which supports modbus RTU. Addition of I/O's can also be done through optional Ethernet port which supports modbus TCP/IP protocol. EZSeries TextPLC can act as a modbus master and as well as slave under software control.
Optional devicenet slave card and optional Profibus slave card is available which can communicate to a master device on their respective Devicenet and Profibus network. If optional Profibus slave card is used then 244 bytes of data can be exchanged between the Profibus master and the PLC. With DeviceNet slave card 256 bytes of data can be exchanged between DeviceNet master and PLC.
The PLC in the EZSeries TextPLC is essentially the same EZ PLC available as a stand-alone product. This is a high-end modular PLC sporting 3ms scantime, 64K byte of user memory, 8192 variables, 8 PID loops, and plug-in I/O modules including intelligent counter and PLS modules. This PLC also fetures extremely easy to use Drag-n-Drop software.
EZSeries TextPLC is one heck of a PLC with built-in Operator Interface, truly a paradigm shift in Micro Automation Controllers.