ASI MFC2000 Działanie - Strona 10

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Last update: 2021/12/20 16:41

Constant Velocity Moves – (with ﬁrmware Version 8.1+)

The MS 2000 controller now uses a full closed loop trajectory driven algorithm for all commanded

moves. This means that the move velocity is controlled as part of the digital feedback loop. Many

users need to have high precision slow speed control. The MS 2000 now provides the smoothest

control possible in a motorized stage. To achieve this unsurpassed control, we have had to impose

some small restrictions in terms of the acceptable velocity values. The controller has a minimum

controlled speed of one encoder count per 64 servo cycles. The table below shows the slowest

controlled speed for various stage conﬁgurations:

6.35 mm Pitch Lead-

XY Stage:

0.5 ms servo

0.69 μm/sec

loop

XYZ Stage:

0.75 ms servo

0.46 μm/sec

loop

The controlled stage speed must be an integer-multiple of the minimum speed. For example, an XYZ

stage with 6.35 mm pitch lead-screw could be programmed to move 0.46 m/s, 0.92 m/s, 1.38 m/s,

etc., but not values between the integer-multiple of the slowest speed. Be aware that at the very

slowest speeds, the condition and cleanliness of the stage, and the calibration of the analog stage

driver circuitry can have a dramatic eﬀect on the smoothness of operation. Please request tech note

TN120 Slow Speed Considerations for further information.

TTL Controlled I/O Functions

Buﬀered TTL input (IN0) and output (OUT0) are available on internal connector SV1 pins 1 & 2

respectively. These lines may be connected to the IN and OUT BNC connectors on the MS 2000 back

panel. The TTL command allows the user to select which functions are active for the IN0 and OUT0

lines. Various functions supported by the TTL command include:

Triggered moves or Z-stack acquisitions

Triggered asynchronous serial stage position reporting

Output pulses upon move completion

Output gated during constant speed motion.

The TTL input functions require the IN0_INT ﬁrmware module. The output functions are available in all

builds.

Automated 1-D or 2-D Scanning

Systems the with SCAN_MODULE ﬁrmware addition have some special commands that make raster

scanning very easy and well controlled. With the SCAN, SCANR, and SCANV commands, you can

deﬁne a raster area and the number of raster lines. The stage will scan each line at constant speed,

followed by rapid retrace. Hardware line sync signals available on SV1 pin 7 for the X or Y axis, as

selected by internal jumper JP1 (1&2 X-axis; 2&3 Y-axis). With the ENC_INT ﬁrmware module encoder

https://asiimaging.com/docs/

ms2000_operation

screw Stage

1.59 mm Pitch Lead-

screw Stage

0.17 μm/sec

0.12 μm/sec

https://asiimaging.com/docs/ms2000_operation

10nm resolution Linear

Encoder equipped Stage

0.31 μm/sec

0.21 μm/sec

Printed on 2022/03/16 04:45