PLC OS sequence

1
PLC OS sequence
INPUTS Watch status and values of HD inputs
PROCESS Inputs are processed according to a
Policy defined by the developer
OUTPUTS HD outputs assignment
2
PLC cycle
Watchdog delay
t
PLC cycle
Code
I N
O U T
Fetch all IO informations
Collect all IO informations
Execute the code sequential ladder,
structured instruction list
state level Grafcet
3
Memories
IO memory Point to IO Input IW4.0 Output
Qw4.0 Input I1.0 Output Q1.16
Data memory saved values M123 MB10 MW4 MF100
Constant memory fixed values KB1 KW100 KF103
2
4
PLC hardware configuration

• This is where you configure the hardware settings
  of your PLC platform
• CPU choice
• Power supply choice
• Communication protocols choice
• Physical Inputs/Outputs configuration

5
Adding a new physical input (1/) example with a
temperature sensor pt100
A rack, a power supply and a CPU have already
been chosen
6
Adding a new physical input (1/) example with a
temperature sensor pt100
Select an analog input module for your
temperature input
7
Adding a new physical input (1/) example with a
temperature sensor pt100
Configure the module you have selected to fit the
sensor device
8
Adding a new physical input (1/) example with a
temperature sensor pt100
Hardware configuration is now OK
9
Adding a new physical input (1/) example with a
temperature sensor pt100
The hardware configuration is updated The
temperature value can be accessed at the memory
cell referenced by IW4.0 because
10
Simple coding
Temperature is in 1/10 of degree Voltage is in
microVolt
Through the use of symbols table we have
11
OPC access
All symbols are exported to a Flat file .scy
The import is also possible
12
OPC server setting
13
OPC client access