Siemens Simatic S7 Series System Manual

Open loop motion control
12.1 Using the PWM output
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
483
Use one of the following methods to open the PWM wizard:
● Click the "PWM" button from the Wizards area of the Tools menu.
● Open the Wizards folder in the project tree and double-click "PWM", or select "PWM" and
press the Enter key.
1. Select a pulse generator.
2. Change the name of a PWM channel, if required.
3. Configure the PWM channel output time base.
4. Generate project components.
5. Use the PWMx_RUN subroutine to control the duty cycle of your PWM output.
Note
PWM channels are hard
-coded to specific outputs:
•
PWM0 is assigned to Q0.0.
•
PWM1 is assigned to Q0.1.
•
PWM2 is assigned to Q0.3.
12.1.2
PWMx_RUN subroutine
To simplify the use of Pulse Width Modulation (PWM) control in your application,
STEP 7-Micro/WIN SMART provides a PWM wizard (Page 482) to configure your on-board
PWM generators and control the duty cycle of a PWM output.
The PWMx_RUN subroutine is used to execute PWM under program control.
LAD / FBD
STL
Description
CALL PWMx_RUN, Cycle, Pulse, Error
The PWMx_RUN subroutine allows you to
control the duty cycle of the output by vary-
ing the pulse width from 0 to the pulse
width of the cycle time.

Siemens Simatic S7 Series Specifications

General

CPU	Varies by model (e.g., S7-300, S7-400, S7-1200, S7-1500)
Communication Interfaces	PROFIBUS, PROFINET, Ethernet, MPI
Programming	TIA Portal, STEP 7
Programming Languages	LAD, FBD, STL, SCL, GRAPH
I/O Modules	Digital, Analog, Specialty modules available
Operating Temperature	0°C to 60°C (standard models)
Mounting	DIN rail mounting
Operating Voltage	24V DC or 120/230V AC (varies by model)
Protection Class	IP20 (standard models)
Memory	Varies depending on the S7 model. Includes work memory (RAM) for program execution, load memory (EEPROM or Flash) for program storage, and system memory for operating system functions. Memory sizes range from kilobytes to megabytes.