Emerson Digitax ST User Manual

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Digitax ST User Guide 109
Issue: 5
The drive Onboard PLC program status parameter indicates to the user
the actual state of the drive Onboard PLC program.
When an Onboard PLC program is installed and running, the lower
display of the drive flashes ‘PLC’ once every 10 s.
The drive Onboard PLC programming events parameter holds the
number of times an Onboard PLC program download has taken place
and is 0 on dispatch from the factory. The Digitax ST is rated for one
hundred ladder program downloads. This parameter is not altered when
defaults are loaded.
The Onboard PLC program maximum scan time parameter gives the
longest scan time within the last ten scans of the drive Onboard PLC
program. If the scan time is greater than the maximum value which can
be represented by this parameter, the value will be clipped to the
maximum value.
The Drive Onboard PLC program first run parameter is set for the
duration of program scan from the stopped state. This enables the user
to perform any required initialization every time the program is run. This
parameter is set every time the program is stopped.
11.6 Onboard PLC trips
The following trips are associated with the Onboard PLC program.
11.7 Onboard PLC and the SMARTCARD
The Onboard PLC program in a drive may be transferred from the drive
to a SMARTCARD and vice versa.
• To transfer an Onboard PLC program from the drive to a
SMARTCARD, set Pr xx.00 to 5yyy and reset the drive
• To transfer an Onboard PLC program from the SMARTCARD to a
drive, set Pr xx.00 to 6yyy and reset the drive.
(Where yyy is the data block location, see Table 10-1 SMARTCARD
data blocks on page 102 for restrictions on block numbers).
If an attempt is made to transfer an Onboard PLC program from a drive
to the SMARTCARD when the drive contains no program, the block is
still created on the SMARTCARD but it will contain no data. If this data
block is then transferred to a drive, the destination drive will then have
no Onboard PLC program.
The smallest SMARTCARD compatible with Digitax ST has a capacity of
4064 bytes and each block can be up to 4064 bytes in size. The
maximum size of a user program is 4032 bytes so it is guaranteed that
any Onboard PLC program downloaded to a Digitax ST will fit on to an
empty SMARTCARD. A SMARTCARD can contain a number of
Onboard PLC programs until the capacity of the card is used.
11.48 Drive Onboard PLC program status
RO Bi NC PT
Ú
-128 to +127
Ö
Value Description
-n
Onboard PLC program caused a drive trip due to an error
condition while running rung n. Note that the rung number is
shown on the display as a negative number.
0 Onboard PLC program is not installed.
1 Onboard PLC program is installed but stopped.
2 Onboard PLC program is installed and running.
11.49 Drive Onboard PLC programming events
RO Uni NC PT PS
Ú
0 to 65,535
Ö
11.50 Drive Onboard PLC program maximum scan time
RO Uni NC PT
Ú
0 to 65,535 ms
Ö
11.51 Drive Onboard PLC program first run
RO Bit NC PT
Ú
OFF (0) or On (1)
Ö
Trip Diagnosis
UP ACC
Onboard PLC program: Cannot access Onboard
PLC program file on drive
98
Disable drive - write access is not allowed when the
drive is enabled.
Another source is already accessing Onboard PLC
program - retry once the other action is complete.
UP div0 Onboard PLC program attempted divide by zero
90 Check program
UP OFL
Onboard PLC program variables and function
block calls using more than the allowed RAM
space (stack overflow)
95 Check program
UP ovr
Onboard PLC program attempted out of range
parameter write
94 Check program
UP PAr
Onboard PLC program attempted access to a non-
existent parameter
91 Check program
UP ro
Onboard PLC program attempted write to a read-
only parameter
92 Check program
UP So
Onboard PLC program attempted read of a write-
only parameter
93 Check program
UP udF Onboard PLC program undefined trip
97 Check program
UP uSEr Onboard PLC program requested a trip
96 Check program

Emerson Digitax ST Specifications

General

Brand	Emerson
Model	Digitax ST
Category	Controller
Language	English