Stober POSIDRIVE MDS 5000, Manual

Page: 270 / 590

System blocks
Block descriptions
ID 441692.01
STÖBER ANTRIEBSTECHNIK
269
367 Position latch with timestamp
Description
The block acquires a position or distance together with a BE driver block with
timestamp output. This position or distance is acquired with µs accuracy using
the two timestamps, independently of the cycle time.
A variety of modes are available:
Mode = 0: Input value on Position is saved with rising edge on LExec .
Mode = 1: Input value on Position is saved with falling edge on LExec .
Mode = 2: Input value on Position is saved with the next edge (no matter
which) of LExec .
Mode = 3: Reserved. For the time being, same as 2.
Mode = 4: Difference measurement on Position from rising edge to rising edge
of LExec
Mode = 5: Difference measurement on Position from falling edge to falling
edge of LExec
Mode = 6: Difference measurement on Position from rising edge to falling edge
of LExec
Mode = 7: Difference measurement on Position from falling edge to rising edge
of LExec
The acquisition status is output on output
LStatus .
LStatus = 0: LExec is "armed." The set event is the trigger event.
LStatus = 1: Saving is concluded in modes 0 to 3. The final state is reached.
In modes 4 to 7 the first trigger event was recognized and the 2nd
event is now being waited for.
LStatus = 2: In modes 4 to 7 saving is concluded. The final state is reached.
When the input
LReset is active, LStatus is reset to 0 and acquisition is
"armed" again as soon as LReset becomes inactive again.
Inputs
No. Name Datatype Scaling Description
1 Mode U8 – Mode of Posi-Latch
2 LExec B – Trigger input
3
LExec-TS
U16 1LSB = 1us Timestamp of the trigger signal
4 Position P64 Skal.-Fktn 8 / 19 Position which is to be acquired
5 Pos-TS U16 1LSB = 1us Timestamp of the position signal
11 LReset B –
0: Normal operation
1: Reset Latch status. Otherwise do not execute any actions.
Outputs
No. Name Datatype Scaling Description
6
LPositio
P64 Skal.-Fktn 8 / 19 Acquired position
7 TS-capt. U16 –
Intermediate storage for the last timestamp of the actual position.
When the Latch is in its final state (either state 1 or 2 depending on
the mode), the timestamp for the acquired position is indicated here.
This is the timestamp of the trigger signal for the last acquired edge
(varies with the different modes).
8 LastExec B – Intermediate storage for trigger signal
9 LastPos P64 Skal.-Fktn 8 / 19 Intermediate storage for the position to be acquired
10 LStatus U8 – Status output of the Latch
12 LastRes B – Reset intermediate storage