Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 214)

Publication 1760-UM002B-EN-P - March 2005
4-104 Wiring with Pico GFX-70
The function block operates according to the following equation:
Y(t) = [T
a
/T
g
] x [K
p
x x(t) - Y(t-1)]
Y(t) = calculated output value for scan time t
T
a
= Scan time
T
g
= Recovery time
K
p
= proportional gain
x(t) = Actual value with scan time t
Y(t-1) = Output value with scan time t - 1
Scan time:
Scan time T
a
depends on the set recovery time value.
GET, Fetch a Value from the Network
The function block allows you to selectively read (get) a 32-bit value from the
network. The GET function block fetches data which another station has
made available on the Pico-Link network with a PUT function block.
IMPORTANT
The function block updates the output value every time
recovery time T
g
expires.
Recovery time T
g
Scan time T
a
0.1 s to 1 s 10 ms
1 s to 6553 s T
g
x 0.01