Siemens SINAMICS S120 Function Manual page 184

Servo control
4.20 Central probe evaluation
Central measuring with handshake
With p0684 = 0, you activate the evaluation procedure with handshake for the central probe
evaluation. You can evaluate a maximum of one positive and/or negative edge per probe
within four DP cycles.
T
DP
T
MAPC
new setpoints).
● Transfer, control word probe (BICO p0682 to PZD3) at the start instant To in the MAPC
cycle.
● The measurement is activated with a 0/1 transition of the control bit for a falling or rising
edge in the probe control word.
● If the measurement is activated, in data bus cycle (e.g. PROFIBUS cycle: DP cycle) a
check is made as to whether a measured value is available.
● If a measured value is available, 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 "0" in
the control word. Then, the associated time stamp is set to "0".
● The measurement is deactivated by a 1/0 transition of the control bit in the probe control
word.
● Transfer with PROFIdrive telegrams 391, 392 or 393.
Central measurement without handshake, two edges
With p0684 = 1, you activate the evaluation procedure without handshake for the central
probe evaluation. You can evaluate a maximum of two edges per probe simultaneously
within two DP cycles. Precondition:
T
DP
If the measurement is activated, a check is made in the DP cycle as to whether a measured
value was acquired:
● If a measured value is available, then the time stamp is entered in either p0686 or p0687
and a new measurement is automatically activated.
● If a measured value is not available, then the time stamp 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.
● The measurement is immediately reactivated after the measured values have been read
out.
● Parallel to acquiring new probe events, the measuring results are transferred to the
higher-level control for one DP cycle without evaluating the success.
● For each probe, a maximum of one rising and one falling edge can be detected for each 2
DP cycles.
● Transfer with PROFIdrive telegrams 391, 392 or 393.
184
= PROFIBUS cycle (also DP cycle)
= master application cycle time (time grid, in which the master application generates
= T (cycle ratio = 1:1, cycle reduction not possible).
MAPC
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions