Modes and Functions
3.4 Pulse train mode
Setting and changing the duty cycle
The range of the duty cycle parameter is selected using the "Output format" parameter. The
TM Pulse 2x24V uses this assigned duty cycle value to calculate the pulse duration. If the
number value you assign exceeds the upper limit, then a duty cycle of 100% of the period
duration is used and this action does not cause an error.
● Output format "Per 100 (%)": Value range 0 to 100
– Pulse duration = (duty cycle/100) x period duration.
● Output format "Per 1000": Value range 0 to 1,000
– Pulse duration = (duty cycle/1,000) x period duration.
● Output format "Per 10000": Value range 0 to 10,000
– Pulse duration = (duty cycle/10,000) x period duration.
● Output format "S7 analog output": Value range 0 to 27,648
– Pulse duration = (duty cycle/27,648) x period duration.
Update the duty cycle
● Permanent update
The duty cycle can be controlled permanently using the control interface. MODE_SLOT
bit has to be set ("1" means permanent update); LD_SLOT must be the value 4 (for duty
cycle). Set the duty cycle as a value in the control interface field SLOT. The unit depends
on the assigned output format.
● Single update
Set the duty cycle in the configuration parameters. Alternatively, perform a single update
using the control interface. MODE_SLOT has to be cleared ("0" means single update);
LD_SLOT must be the value 4 (for duty cycle). Set the duty cycle as a value in the control
interface field SLOT.
● The unit depends on the assigned output format. If you change the duty cycle value
during the output sequence, then the new duty cycle is activated at the next output
sequence.
For more details about the use of the SLOT parameter, see SLOT parameter handling
(Page 113).
Isochronous mode
General information is available in Function: Isochronous mode (Page 86).
Isochronous mode does not have any influence on the functionality of Pulse train operating
mode.
If you want to synchronize the output sequence with T
to "Input" and the Pulse train output sequence starts at T
40
, then set the Function DI parameter
o
.
o
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA