Pilz PSS 4000 automation system Release 12 with safe motion monitoring modules PSSu K F E.

Release 12 of the PSS 4000 automation system includes the addition of the safe motion monitoring modules PSSu K F EI.

The safe motion module and corresponding software blocks gives the ability to monitor up to eight axes per control system (PSSuniversal PLC or PSSuniversal multi) up to PL e, Cat. 4, SIL 3 — with one safe encoder or dual proximity sensors.

The functions that can be monitored include: safe speed range (SSR), in which the maximum and minimum speeds must not pass a certain value; safe speed monitor (SSM), which supplies a safe output signal to indicate motor speed is below a defined limit value; safe direction (SDI) to make sure a drive can only move in one (defined) direction; and safe operating stop (SOS), which monitors the stop position reached by the axis and prevents any deviation from the position window.

The module PSSu K F EI includes two safe outputs to control motor contactors, relays or the STO to drives. The outputs can be directly linked with the motion monitoring functions to ensure fast reaction times (rather than requiring processing from the program). The regular safety program can also switch off the outputs in combination with the software blocks.

This is in addition to existing PSS 4000 safe position monitoring functionality, in which counter modules with software blocks are available for this purpose, along with modules PSSu E F INC and PSSu E F ABS SSI, offering safely limited position (SLP) and safe position monitoring (SP) functionality.