Siemens S7-1200 - Configuring a Pulse Channel for PWM

Extended instructions
8.6 Pulse
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
367
Description
Pulse
Direction
PWM3
Built-in outputs
Q0.4
1
-
SB outputs
Q4.1
-
PTO4
Built-in I/O
Q0.6
2
Q0.7
2
SB I/O
Q4.2
Q4.3
PWM4
Built-in outputs
Q0.6
2
-
SB outputs
Q4.3
-
1
The CPU 1211C does not have outputs Q0.4, Q0.5, Q0.6, or Q0.7. Therefore, these outputs
cannot be used in the CPU 1211C.
2
The CPU 1212C does not have outputs Q0.6 or Q0.7. Therefore, these outputs cannot be used in
the CPU 1212C.
3
This table applies to the CPU 1211C, CPU 1212C, CPU 1214C, CPU 1215C, and CPU 1217C
PTO/PWM functions.
8.6.3
Configuring a pulse channel for PWM
To prepare for PWM operation, first configure a pulse channel in the device configuration by
selecting the CPU, then Pulse Generator (PTO/PWM), and choose PWM1 through PWM4.
Enable the pulse generator (check box). If a pulse generator is enabled, a unique default
name is assigned to this particular pulse generator. You can change this name by editing it
in the "Name:" edit box, but it must be a unique name. Names of enabled pulse generators
will become tags in the "constant" tag table, and will be available for use as the PWM
parameter of the CTRL_PWM instruction.
Table 8- 150 CPU output: maximum frequency
CPU
CPU output channel
Pulse and direction
output
A/B, quadrature, up/down,
and pulse/direction
1211C
Qa.0 to Qa.3
100 kHz
100 kHz
1212C
Qa.0 to Qa.3
100 kHz
100 kHz
Qa.4, Qa.5
20 kHz
20 kHz
1214C and 1215C
Qa.0 to Qa.4
100kHz
100kHz
Qa.5 to Qb.1 20 kHz 20 kHz
1217C DQa.0 to DQa.3
(.0+, .0- to .3+, .3-)
1 MHz 1 MHz
DQa.4 to DQb.1
100 kHz
100 kHz