Date post: | 22-Mar-2017 |
Category: |
Engineering |
Upload: | akansha-gurele |
View: | 246 times |
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Input Process Image:The Processor scans all the input points from
base as well as expansions in input scan & stores the status in input process image.
%IB0 to %IB31 Output Process Image:The processor updates the status of output
points as per the logic scan & stores the updated status in the output process image.
%IB0 to %IB31
Marker Memory Marker memory holds the intermediate
results in the application program. This is addressable global memory.
%MB0 to %MB3999 Data MemoryData memory holds the intermediate results
and function block instance data. This is memory is addressed by user defined symbolic name.
Addressing of Symbols:-
----||----- NO NORMALLY OPEN
----|\|---- NC NORMALLY CLOSED
----( )---- OP O/P COIL ----( R )---- RESET O/P RESET ----( S )---- SET O/P SET
Types Of Timer:1. TON - On delay Timer 2. TOFF - Off Delay Timer3. TP - Pulse Timer No. of Timers-: Unlimited Max Preset Value-: Around 24
days
Types of Counter:1. CTU: Counter Up2. CTD: Counter Down3. CTUD : Counter Up Down Max No. of Counters: Unlimited Max Preset Value: 32767