The basic purpose of the inhibit circuitry is to shut down the drive and inform other components in the system if a fault is detected. The UMI-7764 has circuitry onboard that will OR together four different sources of inhibits; the per axis controller inhibits, the per axis external inhibits (INHINx), the external inhibit all (INHALL), and the host bus interlock. You can use the INHINx lines to shut down an individual axis or the INHALL line to shut down all axes. These are typically wired to the "fault" output of the drive(s) you are using. When the UMI detects an inhibit from any of the four sources, then it will generate an inhibit signal on the INHOUTx lines. The INHOUTx lines are generally connected to the "enable" inputs on the drive(s). The polarity o
f the INHINx and INHOUTx lines is configurable using the switches on the UMI.
Do not simply tie any of these signals high or low with a jumper. Failure to properly connect the inhibit/enable signals can cause (and has caused) expensive damage to your motion system.
Cheers,
Brent R.
Applications Engineer
National Instruments
