A–3Troubleshooting
Publication
1756–6.5.15 – July 1998
Message Description Recommendation
Output Message Type
Scan type prohibits poll bit assignment
Scan type prohibits strobe bit assignment
Scan type prohibits strobe, poll, change of state,
or cyclic bit assignment
The type of I/O communication
indicated does not match the
output data Map’s Map Data To.
Determine what mode of communication you
wish to use: strobe, poll change of state, and/or
cyclic. Be sure that the correct I/O values are
entered for the appropriate communication
mode.
Data Mapping
No output strobe, poll, change state, and cyclic data
size specified for current scan type
The communication module has
been instructed to strobe, poll,
change of state, or cyclic a
message but has not been
allotted any bits to carry out the
command.
Type in the appropriate value in the output data
map’s no. of bits.
Poll Tx size: current scan type prohibits poll
bit assignment
A poll bit has been assigned
without the communication type
set as poll.
Set the mode of communication to poll in Edit
Device I/O Parameters screen.
Input source byte: bit offset is greater than 7 The source bit value is greater
than seven. Eight bits comprise
one byte. When counting the
number bits in a byte, the first bit
begins with zero. Any value
greater than seven indicates
more than eight bits and therefore
more than one byte.
Correctly identify the byte and bit offset for the
data element desired. Reenter the corrected
values for byte and bit
in the input data-map’s
Map Data From.
Output dest byte: bit offset is greater than 7 The destination bit value is
greater than seven. Eight bits
comprise one byte. When
counting the number bits in a
byte, the first bit begins with zero.
Any value greater than seven
indicates more than eight bits and
therefore more than one byte.
Correctly identify the byte and bit offset for the
data element desired. Reenter the corrected
values for byte
and bit in the output data map’s
Map Data To.
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