Example For A Hot Water Tank - ABB AC500-eCo Starter-Kit Getting Started

4.5 Example for a Hot Water Tank

Program part 1: One pump is connected to the Tank via a Valve. One sensor will measure the
liquid level of Tank. If the liquid level of the tank is lower than 4m, the valve of the pump
opens, if the liquid level is higher than 9m, the valve of the pump closes.
Program part 2: On the other side, one heater is inserted into the Tank. One RTD sensor
(Ni1000) will measure the temperature of the liquid. If the temperature is higher than 120° C,
the switch of heater will open to heat the liquid. If the temperature is lower than 60° C, the
switch of the heater will close.
Program part 3: In the output part, if the liquid level is between 4m and 9m, the temperature is
between 60° C and 120° C, the user open the switch of the tank, the water will flow into the
user's part.
The following components are required for this example:
One CPU type PM554
•
One 100-240V AC power supply;
•
One S500 digital I/O module DX561;
•
One S500 analog input module AI561;
•
One S500 analog RTD input module AI562 with Ni1000, -50° C...+150° C (2 wire);
•
A PC with the programming software PS501 installed;
•
One cable (TK503) to connect the PC to the CPU.
•
Symbol table to this example:
%QX4000.0 Alarm for underflow or overflow of liquid level
(waterLevel)
%QX4000.1 Alarm for highest or lowest value of water temperature
(waterTemp)
%QX4000.2 Alarm for user, can't use hot water
%IX0.0 Switch for user take the hot water
%QX0.0 Start watering
%QX0.1 Start warming
%QX0.2 User may take the hot water
%IW1 Measurement value of liquid level
%IW5 Measurement value of temperature
For this example we use Structured Text (ST) as program language.
____________________________________________________________________________________________________
Getting Started with AC500-eCo Starter-Kit
PM554_DO
PM554_DO
PM554_DO
DX561_DI
DX561_DO
DX561_DO
DX561_DO
AI561_AI
AI562_AI_RTD
- 37 -