Siemens Sinamics S120 Function Manual page 133

3. If the measurement is activated, in data bus cycle (e.g. PROFIBUS cycle: DP cycle) a
4. If a measured value is available, then the time stamp is entered into either p0686 or
5. The time stamp is transferred until the control bit for falling or rising edge is set to zero in
6. The measurement is deactivated by a 1/0 transition of the control bit in the probe control
7. Transfer with PROFIdrive telegrams 391, 392 or 393.
Central measurement without handshake, two edges
With p0684 = 1, you activate the evaluation technique 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:
1. If a measured value is available, then the time stamp is entered in either p0686 or p0687
2. If a measured value is not available, then the time stamp zero is entered into either p0686
3. This means that a time stamp is only transferred once before it is overwritten with zero or
4. The measurement is immediately reactivated after the measured values have been read
5. Parallel to acquiring new probe events, the measuring results are transferred to the
6. For each probe, a maximum of one rising and one falling edge can be detected for each 2
7. Transfer with PROFIdrive telegrams 391, 392 or 393.
Central measurement without handshake, more than two edges
With p0684 = 16, you activate the evaluation technique without handshake for the central
probe evaluation. You can evaluate up to 16 signal edges from a maximum of 2 probes
simultaneously within a DP cycle.
DP cycle = PROFIBUS cycle = T
T
MAPC
new setpoints).
1. For each probe, up to 8 rising and/or 8 falling edges can be detected in each DP cycle
2. For each probe it can be selected whether the rising or falling signal edges are to be
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
check is made as to whether a measured value is available.
p0687.
the control word. Then, the associated time stamp is set to zero.
word.
= T (cycle ratio = 1:1, cycle reduction not possible).
MAPC
and a new measurement is automatically activated.
or p0687.
a new time stamp.
out.
higher-level control for one DP cycle clock without evaluating the success.
DP cycles.
= master application cycle time (time grid, in which the master application generates
and saved in a measurement buffer.
taken into account.
DP
Servo control
3.19 Central probe evaluation
131