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Download 505 PLC WorkShop User Guide
Transcript
PLC WorkShop for Siemens 505 Chapter 9 – PID Loops • Ramp/Soak To access the Ramp/Soak Editor: 1. Click PID Loop from the View menu or press ALT+V, P. The PID Loop Directory dialog box appears. The dialog box shows the Loop Mode, Loop number (164), Loop Title, and Enable/Disable state. 2. Select a loop whose ramp/soak program you want to create or modify and then click Ramp/Soak. The following dialog box appears. The R/S Flag Address box contains the ramp/soak flag address. An entry in this field causes ramp/soak data to be written from the ramp/soak variable (LRSF) to another address. The address can be a bit (Y or C) that allocates 5 contiguous bits, or a word (WY or V) that allocates one word for ramp/soak data. The format of the bits in a ramp/soak flag address correspond to the individual bits making up the 16-bit word LRSF. Bits are defined in the following table. BIT LOOP/FUNCTION 1 1= Restart at the first step. To restart, toggle bit off, on, then off again. The restart occurs on the trailing edge of a square wave. 2 1= Hold at current step. To hold, set bit on. 3 1= Jog to next step. To jog, set bit on. Jog occurs on the rising edge of a square wave. - 399 -
