Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 364)

Publication 1760-UM002B-EN-P - March 2005
8-10 Inside Pico GFX-70
Example
Power can be applied to the expansion unit later than the basic unit. This
means that the basic unit is switched to RUN when the expansion unit is
absent. The following Pico GFX-70 circuit diagram detects if the expansion
unit is functional or not functional.
Figure 8.8 Circuit diagram for expansion testing
As long as I 14 is 1, the remaining circuit diagram is skipped. If I 14 is 0, the
circuit diagram is processed. If the expansion unit drops out for any reason,
the circuit diagram is skipped. M 01 detects whether the circuit diagram was
processed for at least one cycle after the power supply is switched on. If the
circuit diagram is skipped, all the outputs retain their previous state.
QA Analog Output The analog output operates with decimal values between 0 and 1023. This
corresponds to a 10-bit resolution. At the output this corresponds to a
physical voltage between 0Vand 10V dc.
Negative values such as: -512 are evaluated as zero and output as 0V dc.
Positive values greater than 1023, such as: 2047, are evaluated as 1023 and
output as 10V dc.
Loading and Saving
Programs You can either use the Pico GFX-70 interface to save programs to a memory
module or use PicoSoft Pro and a transmission cable to transfer them to a PC.
GFX without Display and Keypad
Pico GFX-70 models without buttons and a display can be loaded with the
Pico GFX-70 program via PicoSoft Pro or automatically from the fitted
memory module every time the power supply is switched on.
Interface
The Pico GFX-70 interface is covered. Remove the cover carefully.
I 14----M 01-------------------[ : 08
------------------------------S M 01
I 14--------------------------[ : 08
I 01--
|
-I 02------------------[ Q 01
Q 01-- |