Using PID basic functions
7.4 TCONT_S
PID control
Function Manual, 03/2017, A5E35300227-AC
237
Technology object TCONT_S
The technology object TCONT_S provides a step controller for actuators with integrating
behavior and is used to control technical temperature processes with binary output value
output signals. The technology object corresponds to the instance data block of the
TCONT_S instruction. The operating principle is based on the PI control algorithm of the
sampling controller. The step controller operates without a position feedback signal. Both
manual and automatic mode are possible.
S7-1500
All parameters and tags of the technology object are retentive and can only be changed
during download to the device if you completely download TCONT_S.
Overview of software controller (Page 38)
Add technology objects (Page 40)
Configure technology objects (Page 42)
TCONT_S (Page 496)
Downloading technology objects to device (Page 44)
Configure controller difference TCONT_S
Use process value periphery
To use the input parameter PV_PER, proceed as follows:
1. Select the entry "Periphery" from the "Source" list.
2. Select the "sensor type".
Depending on the sensor type, the process value is scaled according to different
formulas.
– Standard
Thermoelements; PT100/NI100
PV = 0.1 × PV_PER × PV_FAC + PV_OFFS
– Cooling;
PT100/NI100
PV = 0.01 × PV_PER × PV_FAC + PV_OFFS
– Current/voltage
PV = 100/27648 × PV_PER × PV_FAC + PV_OFFS
3. Enter the factor and offset for the scaling of the process value periphery.
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