Yaskawa Microtrac Gateway to Square D Sy/MAX Family of PLCs for use with Microtrac LAN User Manual
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4/12/94
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OPERATION
PLC Gateway Status
Since the 2’s complement number put into the appropriate register will be an
integer, not an integer plus fraction, there must be a way of knowing where the
decimal point is located. This is accomplished in the PAC blocks (NUMI and
NUMO) with the DP (decimal point) parameter. In the example given, the DP
for the pertinent NUMI block must be specified as 2.
In some cases, a 16 bit signed integer (+/– 32,000) may not be sufficient for
the required accuracy needs. For increased accuracy, the IEEE floating point
conversion function in the PLC should be used, and the results stored in two
consecutive 16 bit registers. In order for the PLC gateway to expect this
number format, the DP of the appropriate PAC blocks (NUMI or NUMO)
should be specified as 255 (0FFH). Again, note that two consecutive registers
are used for this format.
The PLC gateway status is displayed on the four (4) character alphanumeric
display that is mounted on the CPU card. When the system powers up, it
displays the “P-UP” status message. If an error condition occurs, then the
proper error status message will be displayed. In this way, the status message
for the last error condition will always be displayed.
If it is desired not to display an old error, then the PLC gateway needs to be
powered down and then back up, or press the RESET push button on the CPU
card. Doing this is normally not recommended, because the PLC gateway will
go through its initialization steps, which may take several seconds, and
includes turning outputs off during this time.
The following is a list of status messages that may be displayed and their
meanings:
DISPLAY
MEANING
P-UP
Code is running without error.
8EXX
80188 Error coded in XX, where XX is in hex:
00 = No error
01 = Unsupported interrupt occurred
AEXX
ARCNET Error coded in XX, where XX is in hex:
00 = No error
FF = ARCNET Controller doesn’t reset
PEXX
PLC Error coded in XX, where XX is in hex:
00 - 87 = Command/REply error code as given in
SY/LINK Network Interface manual
FD = No response from SY/LINK within timeout
after command
FE = SY/LINK did not accept setup parameters
FF = SY/LINK did not respond to reset
PLC Gateway
Status
RD 914-10