Delta RMC151 - Manual (Page 951)

9 Register Reference
Excessive Delay
The timing diagram below shows an SSI system with a time delay of more then one clock
period. On the first rising edge of the Clock, the SSI device puts the first bit of data on
the Data line. By the next rising edge of the Clock, when the RMC samples the data, the
data from the SSI device has not yet arrived, and the SSI input will not return the correct
value.
To compensate for the delay, set SSI Wire Delay parameter. You can enter the wire
length or enter the time delay directly. The SSI input will then use the delay value to
correctly read the SSI input data.
9.2.2.2.23.10. SSI Home Source
Type: Axis Parameter Register
RMC70 Address: %MDn.10/20-23, where n = 12 + the axis number
RMC150 Address: n/a
System Tag: _Axis[n].MDTSSICfg.SSIHomeSrc
How to Find: Axes Parameters Pane, All tab: Feedback
Data Type: Bits - see below
Description
This parameter is available only on RMC70 SSI axes configured as Incremental. This
parameter specifies the input to use as a home input. By default, this parameter is set to
none.
Inputs that can be used as an SSI Home Source are:
• The Fault Input of the axis
• %IX0 - %IX11 (discrete inputs 0 - 11)
See the Homing topic for details on homing.
Format Details
This section is primarily for addressing the SSI Home Source parameter when
communicating with the RMC from an external device. This information is not necessary
when configuring the SSI Home Source in RMCTools.
The SSI Home Source is selected with bits 20-23 in the MDT/SSI Configuration Register.
These bits correspond to the SSI Home Source as shown in the following table:
RMC70
Value of
bits 20-23 SSI Home Source
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