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7. TROUBLESHOOTING
!
WARNING power before replacing the instrument.
before mounting or removing the instrument.
all the wiring is completed.
instrument.
experience in this type of work.
48
CAUTION
All wiring must be completed before power is turned on to prevent electric shock, instrument failure, or incorrect action.
The power must be turned off before repairing work for input break and output failure including replacement of sensor, contactor or SSR, and all wiring must be completed before power is turned on again.
This section lists some of the main causes and solutions for communication problems.
If you can not solve a problem, please contact RKC sales office or the agent, on confirming the type name and specifications of the product.
Problem
No response
Probable cause
Wrong connection , no connection or disconnection of the communication cable
Breakage, wrong wiring, or imperfect contact of the communication cable
Mismatch of the setting data of communication speed and data bit configuration with those of the host
Wrong address setting
Solution
Confirm the connection method or condition and connect correctly
Confirm the wiring or connector and repair or replace the wrong one
Confirm the settings and set them correctly
Continued on the next page.
IMR01D02-E3
7. TROUBLESHOOTING
Continued from the previous page.
Problem Probable cause
No response
Error in the data format
Transmission line is not set to the receive state after data send (for RS-485)
EOT return The specified identifier is invalid
Error in the data format
NAK return Error occurs on the line (parity bit error, framing error, etc.)
Solution
Reexamine the communication program
Confirm the identifier is correct or that with the correct function is specified.
Otherwise correct it
Reexamine the communication program
Confirm the cause of error, and solve the problem appropriately. (Confirm the transmitting data, and resend data)
BCC error
The data exceeds the setting range
The specified identifier is invalid
Confirm the setting range and transmit correct data
Confirm the identifier is correct or that with the correct function is specified.
Otherwise correct it
IMR01D02-E3 49
7. TROUBLESHOOTING
Problem
No response
Probable cause
Wrong connection , no connection or disconnection of the communication cable
Breakage, wrong wiring, or imperfect contact of the communication cable
Mismatch of the setting data of communication speed and data bit configuration with those of the host
Confirm the connection method or condition and connect correctly
Confirm the wiring or connector and repair or replace the wrong one
Confirm the settings and set them correctly
Solution
Error code
1
Error code
2
Error code
3
Error code
4
Wrong address setting
A transmission error (overrun error, framing error, parity error or CRC-16 error) is found in the query message
The time interval between adjacent data in the query message is too long, exceeding
24 bit’s time
Function cod error
(Specifying nonexistent function code)
When written to read only (RO) data,
When any address other than 0000H to
001AH is specified, etc.
When the data written exceeds the setting range, When the specified number of data items in the query message exceeds the maximum number of data items available
Self-diagnostic error
Re-transmit after time-out occurs or verify communication program
Confirm the function code
Confirm the address of holding register
Confirm the setting data
Turn off the power to the instrument. If the same error occurs when the power is turned back on, please contact RKC sales office or the agent.
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IMR01D02-E3
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