Fault Input

The Fault Input is a purpose-specific input and is intended to be connected to a drive amplifier or other source for a safety interlock. Using the Fault Input is optional.

When the Fault input is active, the Fault Status bit will turn on and the Fault Error bit will latch on. This will cause a halt if the Auto Stops are configured to do so, and the axis is not in the Direct Output state.

Supporting Modules

RMC75/150

On the RMC75 and RMC150, only dedicated Fault Inputs can be used as Fault Inputs. The modules listed below have one Fault Input per Control Output.

RMC75:MA, AA, QA

RMC150:Quad (Q)

RMC200

Any discrete input on any RMC200 module may be used as a Fault Input.

The CA4 module has one Fault Input per Control Output. That Fault Input may be used as a Fault Input, or as a general-purpose discrete input.

The CV8 module has eight discrete I/O points that may be used general-purpose discrete inputs, or as Fault Inputs.

The U14 module has four discrete I/O points that may be used general-purpose discrete inputs, or as Fault Inputs.

The CA4, CV8, and U14 discrete inputs are not assigned to function as Fault Inputs by default. To assign an input to function as a Fault Input, see Configuring a Fault Input below.

Configuring a Fault Input

RMC75/150

In the Axis Parameters, on the All tab, expand the Output section.
Set the Fault Input Polarity parameter to define whether the input should be active when the voltage applied across the Fault Input is high or low.

RMC200

In the Axis Parameters, on the All tab, expand the Output section.
For the desired axis, click the Fault Input Source parameter.
From the drop-down list, choose a discrete input.
1. If you wish to use the dedicated Fault Input on the CA4, choose Dedicated.
2. The other discrete inputs on the RMC are listed by the IEC address of %IXs.n, where s is the slot number and n is the number of the IO point on the module.
  The slot numbering s begins with 0 for the power supply, 1 for the CPU, 2 for the first IO module slot, etc.
Fault Input Polarity parameter to define whether the input should be active when the voltage applied across the Fault Input is high or low.

Additional Uses

On the RMC75 and RMC150, the physical Fault Input can be used for SSI homing (RMC75 Only), Physical Limit Inputs, and can be used as a general-purpose input by setting the Fault Input Autostop for the associated axis to Status Only. However, the input will not appear in the Discrete I/O Editor or Discrete I/O Monitor, and cannot be assigned a user tag name. It's state can be accessed via the Fault Input status bit.

On the RMC200, if the Fault Input axis parameter is set to none, the physical Fault Input can be used a general-purpose input. The input will be listed in the Discrete I/O Editor and can be assigned a user tag name.

Specifications

For specifications, refer to the topic of the specific module containing the Control Output.