Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 358)

Publication 1760-UM002B-EN-P - March 2005
8-4 Inside Pico GFX-70
Example: Do not Wire Backward
This example is shown in Creating and Modifying Connections on page 4-21. It was
used here to illustrate how NOT to do it.
In the third circuit connection, Pico GFX-70 finds a connection to the second
circuit connection in which the first contact field is empty. The output relay is
not switched.
When wiring more than four contacts in series, use one of the marker relays.
Figure 8.1 Circuit diagram with M 01 marker relay
Evaluation of the High-Speed Counters CF, CH and CI
To evaluate the count pulses of 3 kHz, the high-speed counter function blocks
operate with an interrupt routine. The length of the circuit diagram and the
associated cycle time has no effect on the counter result.
Memory Management of the Pico GFX-70
The GFX is provided with three different memories.
• The working memory or RAM, size 8 KByte
The RAM only stores the data when the device power supply is active.
• The screen memory, size 24 KByte
The screen memory stores the visualization data created with PicoSoft
Pro retentively.
• The program memory, size 8 KByte
The program memory stores the program retentively.
Distribution of Data in the RAM
When the power supply is switched on, the RAM stores the program, the
retentive data and the screens to be displayed. This has a direct effect on the
size of the program and the screens. The number of retentive data bytes
reduces the memory available for program and screens. The largest screen to
be displayed likewise reduces the memory available for the program.
I 01----Q 04--
|
|
------- |
| --------I 03--
L: 8 C:2 B:7688
I 01----Q 04----I 03----I 05---[ M 01
I 02----I 04----M 01-----------[ Q 02