Hardware Information Communication Error "Pro." Occurs - Mitsubishi Electric MELSEC iQ-R Series User Manual

Hardware information communication error "PRO." occurs

Symptom Cause
Hardware information Communications were
communication error signal performed with a control
"PRO." turns ON. procedure different from the
C24 communication protocol
setting.
Some of the data are different
from the control procedure.
Designated command does
not exist.
The device number
designation is not the
character count
corresponding to the
command.
The characters in the
message include a data other
than the "A to Z", "0 to 9",
"(SP)", and control data.
A device number outside the
designated range was
designated.
Corrective action
Check the data transmitted from the target device with the
Circuit Trace function of Engineering tool, and take the
following corrective actions.
• Check the C24 communication protocol setting and the
message from the target device and match the settings, or
correct the message and restart data communications.
Check the data transmitted from the target device with the
Circuit Trace function of Engineering tool, and correct it if the
message is in correct.
■Remarks
Only the data "0 to 9" and "A to F" can be handled as character
area data during communications using MC protocol (ASCII
mode).
Therefore, when transmitting a character string as data,
convert the ASCII code of each character string to 2-byte
ASCII code.
• Transmitting the character "G"
The ASCII code for "G" is 47H, and is transmitted as the two
bytes 34H, 37H.
• Transmitting the character "A"
The ASCII code for "A" is 41H, and is transmitted as the two
bytes 34H, 31H.
(When 41H, ASCII code for "A" is transmitted unchanged,
C24 ASCIIBIN conversion will convert it to AH(10) and
pass it to the CPU module.)
• When specifying a device, check "Device Setting" of the
parameters written to the CPU module and correct it to a
device No. within the designated range and restart data
communications.
MC Non Bi
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27 TROUBLESHOOTING
27.3 Troubleshooting by Symptom
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