Delta MMC120 - Manual (Page 54)

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• The entire step table
Each section is protected by a checksum; these checksums are tested on module power-
up and reset.
Determining if the FLASH Data was Used
Prior to issuing the first Set Parameters command on an axis, the Initialized bit in the
STATUS word will be cleared. While this bit is cleared, the Parameter error bit in the
STATUS word of each axis will indicate whether the FLASH memory checksums were
valid.
If the parameter error bit for axis 1 is set on startup, then the checksum for section 1 was
invalid and default parameters and profiles will be used. If the parameter error bit for
axis 2 is set on startup, then the checksum for section 2 was invalid and a blank step table
will be used.
Storing Data in the FLASH
To update the FLASH information, you must first download correct data to the MMC120
volatile memory. Use the Set Parameter , Set Profile , and Event Step Transfer commands
to download the information to the motion controller.
After the data to be stored has been downloaded to the motion controller’s volatile
memory, transfer it to the FLASH memory using the Update FLASH command. To
transfer data to section 1 (both parameters and profiles), put a ‘1’ in the COMMAND
VALUE field when the Update FLASH command is issued. To transfer data to section 2
(event steps), put a ‘2’ in the COMMAND VALUE field when the Update FLASH
command is issued.
The Acknowledge bit of the
STATUS word is used to report the result of the update. If
the FLASH updated successfully, then the Acknowledge bit of axis 1 is toggled.
Otherwise the Acknowledge bit of axis 2 is toggled.
The disadvantage of storing configuration data in the motion controller is that, when one
module is replaced with another, the parameters, profiles and event steps must be loaded
into the new module. Because of this, all parameters, profiles and event step table data
must be stored either in the control program or in monitor program files so they can be
later transferred to the motion controller when needed.
LED Indicators
There are 14 green and red light emitting diodes (LEDS) used on the front panel of the
MMC120. These LEDS provide status information about the module and each of the two
axes.
The LED labeled “F” is the FAIL indicator for the MMC120 microprocessor. If the
FAIL indicator is red, the drive outputs are disabled, and the axes will not move unless
the value is out of null.
The LED labeled “Active” indicates the status of communications over the back plane.
When this LED is green, communication is normal. When it is off, the communication