Umi-7764 and P70360

[Sarevok]

I have the following motion control system: PCI-7340 in the host PC, connected to UMI-7764, and the UMI connected to the P70360 drive according to figure 4.a from the following link, in addition to the required inputs (+5V and Gnd):

http://zone.ni.com/devzone/cda/tut/p/id/3442

The motor used is T21NRLC-LDN, with a double shaft.

The motion control system is perfectly functional in open-loop mode.

My questions are:

1) What are the forward limit, home, and reverse limit terminals good for? I mean, from where do the wires go into these terminals?

2) What is connected to the breakpoint and trigger terminals?

3) If i connect a signal to an analog input on the umi-7764, how can I read it (i mean its binary value)?

4) Are there any pins from the J4 connector of the P7000 drive, besides the ones already used (including pins 19 and 25), that could be connected to any of the unused screw terminals of the UMI? (limits and home, especially).

My intent is to make a more advanced stepper motion control system.

Thanks in advance.

[Jochen]

Hi Sarevok,

here are the answers to your questions:

1. The limit terminals can be connected to mechanical switches. These are typically used to limit the travel range of an axis and to provide a reference point. Please refer to the UMI's manual for further information.
2. In breakpoint mode NI motion control boards can output trigger signals at the breakpoint terminals when an axis reaches a certain position. Trigger inputs can be used to capture the current position of an axis by applying an external trigger signal to these terminals (high speed capturing). Both features can be used to synchronize motion with other devices like data acquisition boards, frame grabbers, bus interfaces and so on. There is good example code for both features that ships with NI-Motion.
3. The ADCs can be read with flex_read_adc16_rtn in C or with the Read ADCs vi in LabVIEW. The ADCs need to be enabled beforehand.
4. If you are using the designated cable between the P7000 and the UMI, there are no additional connections to be added.

Kind regards,

Jochen