Technical data

Drive functions
7.1 Servo control
Function Manual
176 Function Manual, 06/2012, 6SL3097-4AB10-0BP4
Central measuring with handshake
● Evaluation technique with handshake, as long as p0684 = 0.
● Transfer, control word probe (BICO p0682 to PZD3) at the instant To in the MAP cycle.
● A measurement is activated with a 0/1 transition of the control bit for falling or rising edge
in the probe control word.
● If a measurement is activated, a check is made in the DP cycle as to whether a measured
value is present.
● If the check indicates that there is a measured value, then the time stamp is entered into
either p0686 or p0687.
● The time stamp is transferred until the control bit for falling or rising edge is set to zero in
the control word. Then, the associated time stamp is set to zero.
Central measurement without handshake
When selecting the evaluation technique without handshake (p0684 = 1), the measurement
for falling and rising edge is activated.
If a measurement is activated, a check is made in the DP cycle as to whether a measured
value was detected:
● If the check indicates that a measured value is available, the time stamp is entered in
either p0686 or p0687 and a new measurement is automatically activated.
● If the check indicates that a measured value is not available, then a time stamp of zero is
entered into either p0686 or p0687.
● This means that a time stamp is only transferred once before it is overwritten with zero or
a new time stamp.
● Max. edge detection cycle < 1 / T_DP
Remarks
Applications other than the application actually using the function can monitor the probe
state and read the probe measured values.
Example:
EPOS axially controls "its" probe, a control can establish a connection to the probe to read
its signals and the information can be integrated into the drive telegram.
Parameter p0684 (central probe evaluation technique) offers the following setting options:
● p0684 = 0: Measuring with handshake (factory setting)
● p0684 = 1: Measuring without handshake
● It cannot be guaranteed that the standard PROFIdrive connection will not fail.
● The function "without handshake" has been released for "integrated" platforms (e.g.
SINAMICS integrated in SIMOTION D425).
● You must use the MIT handshake version to ensure absolute reliability when detecting
the probe.