Eaton easyE4 Manual page 358

6. Function blocks
6.1 Manufacturer function blocks
354
KP Proportional gain factor
The input KP is used to define a proportional gain factor.
The value <100> corresponds to a KP factor of 1, the value 50 corresponds to a KP of
0.5 etc.
Scan time Tc
The TC input defines the time between the function block calls. Values between 0.1s
and 6553.5s can be defined.
If the TC scan time is set to 0, the program cycle time defines the time difference
between the function block calls. This may cause irregularities in the control response
as the program cycle time is not always constant. The ST (set cycle time) function
block should be used to set a constant program cycle time, please refer to → "ST - Set
cycle time", page 503.
A combination of two devices easyE4 is ideal for applications
requiring lengthy calculations or visualizations such as PID
closed-loop control tasks with the PID controller and also visu-
alization functions at the same time.
In these kinds of applications, move the time consuming cal-
culations to a second device, possibly without an integrated
display, which you can connect via NET.
Assigning operands
You can assign the following operands to the function block inputs that are numeric
inputs.
Operators
1)
Constant, timer constant
MD, MW, MB - Markers
NB, NW, ND - NET markers
nNB, nND, nND- NET markers
NET station n
IA - Analog input
QA - Analog output
QV - QV - Numeric output of a FB
1) Only on function blocks T, AC
2) Only on projects with ≥ 2 base devices on NET
You can assign the following operands to the function block inputs that are bit inputs:
Operators
Constant 0, constant 1
M – Markers
2)
RN - Input bit via NET
SN - Output bit via NET (send)
2)
N - Net marker bit
easyE4 10/19 MN050009 EN www.eaton.com
Value inputs
x
x
2)
x
2)
x
x
x
x
Bit inputs
x
x
x
2)
x
x