Siemens SIMATIC ET 200SP Manual page 69

Isochronous mode
General information is available in the "Function: Isochronous mode" topic.
In isochronous mode, the output sequence is synchronized with the moment T
duration is coordinated to the application cycle (the synchronous cycle, a multiple of the
PROFINET cycle). The behavior in the DC-motor mode is the same than the behavior in the
operating mode PWM. Please refer to the corresponding chapter in this manual. Only the
differences are listed below:
● During the "pulse duration phase" (high phase), the status of the outputs is as follows:
– In forward direction: DQn.A is 1 and DQn.B is 0
– In backward direction: DQn.A is 0 and DQn.B is 1
● During the "interpulse duration phase" (low phase), the status of the outputs is as follows:
– DQn.A is 0 and DQn.B is 0
● The parameter "Function DI" can be parameterized as "External stop" in isochronous
mode to use the rising edges on the DIn.0 to stop the motor. Note that if "Function DI" is
parameterized as "HW_ENABLE" in isochronous mode which is not supported, it will be
interpreted as "External stop" by the TM Pulse 2x24V module.
Setting and changing the On-delay
● Permanent update
The On-delay can be controlled permanently using the control interface. The
MODE_SLOT bit has to be set (permanent update); LD_SLOT must have the value 2 (for
On-delay). Set the On-delay as a value between 0 μs and 85,000,000 μs in the field
SLOT. The unit is always microseconds.
● Single update
Set the On-delay as a value between 0 μs and 85,000,000 μs in the configuration
parameters. The unit is always microseconds. Alternatively, perform a single update
using the control interface. MODE_SLOT has to be cleared (single-update); LD_SLOT
must have the value 2 (for On-delay). Set the On-delay as a value between 0 μs and
85,000,000 μs in the field SLOT.
If you change the On-delay value during the output sequence, then the new On-delay is
activated at the next output sequence. For more details about the use of the SLOT
parameter see SLOT parameter handling.
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA
Modes and Functions
3.7 DC motor mode
. The period
O
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