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α
2 Simple Application Controllers
FB Name
U/D Counter
[UD]
Compare
[CP]
Analog
Output
[AO]
Offset
Gain
[OG]
Display
[DP]
Zone
Compare
[ZC]
Schmitt
Trigger
[ST]
Hour Meter
[HM]
Speed
Detect
[SPD]
FB Symbol
Description of Function Block
The Up/Down Function block positively or
U
0 0
0
negatively increments the counter until a
D
P
O
set value is reached thereby setting the
output ON. A preset signal can also equal
C
U
D
the set value regardless of the current value
P
for the function block and thereby setting
the output ON.
The Compare Function Block monitors the
0 0
0
current value of the input pin in relation to a
I
P
O
preset expression. The expression consists
of =,>,>=,<,<= or <>. If the compared value
C
P
satisfies the expression subsequently the
output pin is set on.
0 0
0
The Analog Output function takes a digital
M
P
value input and delivers a corresponding
E
analog voltage or current to a selected
A
O
channel on the AL2-2DA module.
0 0
0
The Offset Gain Function Block is based
I
P
upon a linear function Y=A/B∗X+C to which
the value obtained from an analog input
O
G
(X:A01-A08) is set.
0 0
0
The Display Function Block is used as an
interface between the user and the devices
I
P
held within the controller. Current values,
D
P
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
0 0
0
identifies whether the input value lies within
I
P
O
a specified upper and lower limited zonal
area and if so changes the status of the
Z
C
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
0 0
0
compares an input value to preset high and
I
P
O
low limits. The output is ON when the input
value reaches the high limit and then falls
S
T
below the lower limit. The function only
processes the data when the function block
is receiving an input signal.
The Hour Meter Function Block holds the
0 0
0
output status ON for a maximum of 32767
I
P
O
hours, 59 minutes and 59 seconds. If the
input pin is turned OFF the elapsed time
C
H
M
will hold its value until either the clear pin
resets the time or the input pin is turned ON
again.
The Speed Detect Function Block is used to
count the incoming pulses max. 20Hz (with
I
0 0
0
an extension module max. of 1kHz) for a
U
P
O
set period of time. The upper and lower
C
limits can be set from -32768 to +32767
S
P
D
and the Period interval's set range is 1 to
32767 in 10ms increments.
Appendix 8
Memory
Section
Use
22 Byte
6.12
17 Byte
6.13
17 Byte
6.14
22Byte
6.15
*4
6.16
20 Byte
6.17
19 Byte
6.18
19 Byte
6.19
25 Byte
6.20
8 - 5
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