Siemens SIMATIC ET 200SP Manual page 58

Modes and Functions
3.6 Frequency output mode
Starting the output sequence
Your control program must issue the enable for the output sequence, using the software
enable (SW_ENABLE 0 → 1).
The STS_SW_ENABLE feedback bit indicates the software enable pending at the
TM Pulse 2x24V.
You can also set the DIn.0 digital input of the TM Pulse 2x24V as a HW enable with the
"Function DI" parameter.
If you want to use the hardware enable, it has to be combined with the software enable.
When SW_ENABLE has been enabled, the output sequence starts at the first positive edge
of the hardware enable. Further positive edges of the hardware enable during the current
output sequence are ignored by the TM Pulse 2x24V.
When the enable is issued (positive edge) and remains high for the time of the input delay
(noise filter), the On-delay is started and the STS_ENABLE set. The frequency sequence is
output on expiration of the On-delay. The output sequence runs continuously as long as
SW_ENABLE is set.
Note
TM_CTRL_DQ technology module output control signal
• If TM_CTRL_DQ = 1, then the TM Pulse 2x24V module has control and produces pulse
sequences at the DQn.A output.
• If TM_CTRL_DQ = 0, then the CPU has control and your program can set DQn.A/DQn.B
outputs directly with the SET_DQA/SET_DQB control bits.
Canceling the output sequence
Disabling the software enable (SW_ENABLE = 1 → 0) during the On-delay or frequency
output cancels the current output sequence and the last period duration is not completed.
STS_ENABLE and the DQn.A digital output are immediately reset to 0.
You must restart the output sequence to begin new pulse output.
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Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA