Siemens SIMOVERT MASTERDRIVES Manual page 183

05.2006
NOTE
Siemens AG 6SE7087-6QX70 (Version AG)
SIMOVERT MASTERDRIVES
Set setpoint transfer with edge control [SPV_RIE_TYP] = 0
If edge-controlled transfer is selected, the active setpoint values are
always valid at the same time as the rising edge on SPV_RIE from
0 → 1.
After transfer of the setting values, the SPV_RIE_ACKN transfer
acknowledgement is set as checkback for the user. An
acknowledgement-controlled setpoint transfer can be implemented with
the checkback signal SPV_RIE_ACKN (see section "Acknowledge
transfer").
Set/setpoint transfer with constant transfer [SPV_RIE_TYP] = 1
If constant setpoint transfer is selected, all the pending setting values
are transferred immediately as valid values. A rising edge on SPV_RIE
0 → 1 no longer has any effect on this. The checkback signal
SPV_RIE_ACKN has no function in this mode of setpoint transfer and
therefore remains at logical zero.
The following limitation applies to constant setpoint transfer:
The relative positioning type (POS_TYP = 1) is locked in the case of
constant setpoint transfer (SPV_RIE_TYP = 1).
The valid speed setpoint is set to 0%.
Therefore, no relative positioning is possible with constant setpoint
transfer.
Reason:
For a relative travel movement, the travel path is started as an
incremental dimension with a rising edge on POS_ON. Therefore, only
an edge-controlled transfer makes sense.
Acknowledge transfer [SPV_RIE_ACKN]
With edge-controlled transfer, the signal [SPV_RIE_ACKN] is set as
checkback for the user after transfer of the setting values. If the control
signals and setpoints are transferred from a higher-level system (e.g.
PC, SIMATIC S7) in conjunction with the communication capabilities of
the basic unit, the acknowledge transfer can be employed by the user
to initiate the [SPV_RIE] signal under acknowledgement control.
Compendium Motion Control
Functions
7-17