Rockwell Automation 1760 Pico GFX-70 Controllers Quick Start - Manual (Page 38)

Publication 1760-QS002A-EN-P - April 2004
6-6 Lesson 4
setpoint SH). We can use this signal in the circuit diagram to reset
marker byte 1 to zero.
The function block coils are located on the left of the function block
and are also shown in normal type. These coils are needed for
activating a function block or supplying it with count pulses. We have
already implemented the supply of the count pulses via C_.
If you have used any contacts or coils in the circuit diagram, this is
highlighted in the function block with green circles .
To complete the wiring of our circuit diagram let's move back to it
(menu: View, Function Blocks or via the
button).
The aim of our task is to visually display the actual value of the
counter using outputs Q1-Q4. As the actual value is stored in marker
byte 1, we can use marker bits 1-4 (M1 - M4) for controlling the
outputs (see the following table).
The control of Q1-Q4 is implemented as follows:
Applicable to
MD, MW, MB,
M Left = Most
significant bit,
byte, word Right = Least
significant bit,
byte, word
32-bit MD1
16-bit MW2 MW1
8-bit MB4 MB3 MB2 MB1
1-bit M32...M25 M24...M17 M16...M9 M8...M1