A–2 Troubleshooting
Publication
1756–6.5.15 – July 1998
Message Description Recommendation
Input Maps 1-4
Number of strobe bits exceeds strobe Rx size The no. bit value exceeds the
strobe Rx size value.
The no. bits (number of bits) indicated in the
input data-map must be equal to or less than the
strobe Rx size. Please note that no. bits
indicates
bits while the strobe Rx size indicates bytes.
Number of poll bits exceeds poll Rx size The no. bit value exceeds the poll
Rx size value.
The no. bits
(number of bits)
indicated in the
input data-map must be equal to or less than the
poll Rx size. Please note that the no. bits
indicates bits while the poll Rx size
indicates bytes.
Data bits mapped beyond end of the input table Input bits have been mapped
outside the boundaries of
the input table.
Reevaluate where you would like to map your
input bits. Enter the correct values in for word
and bit
in the output map’s
Map Data To.
Input Message Type
Scan type prohibits poll bit assignment
Scan type prohibits strobe bit assignment
Scan type prohibits strobe and poll bit assignment
The type of I/O communication
indicated does not match the
input data map’s Map Data From.
Determine what mode of communication you
wish to use: strobe, poll, change of state, and/or
cyclic. Be sure that I/O values are entered for the
appropriate communication mode.
Output Maps 1-4
Number of strobe bits greater than 1 Each device has one bit of
information in the output strobe
message; therefore, it is not
possible to map more than one
bit of output data per device into
the strobe message.
Reenter the correct value for no. bits (number
of bits). This must be either one or zero.
Strobe bit assignment inconsistent with device
node address
The bit mapping is incorrect for
the designated device.
Match the device’s node address to the proper
position within the strobe message. For example:
node address 1 would be mapped to bit 1 of byte
0.
Number of poll bits exceeds poll Tx size The
value entered for bit exceeds
the value entered for poll Tx size.
The no. bits
(number of bits) indicated in the
output data-map must be equal to or less than
the poll Tx size. Please note that the no. bits
indicates bits while the poll Tx size
indicates bytes.
Data bits mapped beyond end of the output image table Output bits have been mapped
from outside the boundaries of
the output image table.
Reevaluate from where you would like to map
your output bits. Enter the correct values for word
and bit
in the output map’s Map Data From.
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