The fourth-generation Pilz PMI operator interface and diagnostic display units offer improved performance. Both the PMIvisu and PMIopen series are available in the fourth-generation specification, with the PMIvisu models being suitable for diagnostics and visualisation with PNOZmulti modular safety systems, PSS programmable safety and control systems and SafetyBUS p networks. The fourth-generation PMIvisu units can also be used as graphics systems for all common programmable logic controllers (PLCs). If custom software needs to be run on the display, then the PMIopen operator terminals can be specified.
The main feature of the fourth-generation units is the hardware platform that features a high-performance 624 MHz CPU with 128 MB of RAM and 64 MB of flash memory. Brighter, high-contrast TFT displays have also been incorporated to improve legibility, and the LPT, VGA and USB interfaces that were previously optional are now integrated as standard. Ethernet (10/100 Mbps) and dual serial ports are also standard, and customers can retrofit fieldbus modules for use with Modbus RTU, Modbus TCP/IP, ProfibusDP and CANopen.
While the panel cut-out dimensions are unchanged from previous generations, the housing has been redesigned so that the signal earth is separated from the housing earth, which makes it possible to monitor for earth faults on the control cabinet.
The capability to use multiple PLC drivers simultaneously means that the same unit can be configured to monitor both control and safety systems. To meet the needs of different applications, the PMI is available with 6.5", 10.4", 12.1" and 15" displays.
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