SMC Networks aPNEUALPHA2 Series Programming Manual page 50

α
PneuAlpha2 Simple Application
FB Name
Time
Switch
[TS]
Time
Switch m
[TSm]
Counter
[CN]
U/D
Counter
[UD]
Compare
[CP]
Offset
Gain
[OG]
Display
[DP]
Zone
Compare
[ZC]
Schmitt
Trigger
[ST]
FB Symbol Description of Function Block
The Time Switch Function Block uses a
predefined time schedule to control the ON
and OFF status of the output.
The Time Switch maintenance Function
Block uses a predefined time schedule to
control the ON and OFF status of the
output. The function block can be setup
from the TopMenu via the front panel keys.
The Counter Function Block increments the
current value by one as and when the input
pin receives a signal. When the current
value reaches the set value the output is set
ON. The counter current value is reset as
and when the clear pin receives an input.
The Up/Down Function block positively or
negatively increments the counter until a
set value is reached thereby setting the
output ON. A preset signal can also equal
the set value regardless of the current value
for the function block and thereby setting
the output ON.
The Compare Function Block monitors the
current value of the input pin in relation to a
preset expression. The expression consists
of =,>,>=,<,<= or <>. If the compared value
satisfies the expression subsequently the
output pin is set on.
The Offset Gain Function Block is based
upon a linear function Y=A/B ∗ X+C to which
the value obtained from an analog input
(X:A01-A08) is set.
The Display Function Block is used as an
interface between the user and the devices
held within the controller. Current values,
timer messages, user-defined messages
can be read.
T h e Z o n e C o m p a r e F u n c t i o n B l o c k
identifies whether the input value lies within
a specified upper and lower limited zonal
area and if so changes the status of the
output accordingly.
T h e S c h m i t t Tr i g g e r F u n c t i o n B l o ck
compares an input value to preset high and
low limits. The output is ON when the input
value reaches the high limit and then falls
below the lower limit. The function only
processes the data when the function block
is receiving an input signal.
Function Blocks 6
Memory
Section
Use
*2 6.10
*2 6.10
16 Byte 6.11
22 Byte 6.12
17 Byte 6.13
22Byte 6.14
*4 6.15
20 Byte 6.16
19 Byte 6.17
6 - 2