Standard Errors
Error Message Contents Solution
Timeout Although a request to send is given to the PLC, no answer is returned within the specified time.
  1. Check the communication parameters.
  2. Check the cables and wiring.
  3. Data may be disrupted because of noise. Fix noise.
Parity An error occurred in parity check.
  1. Check the cables and wiring.
  2. Data may be disrupted because of noise. Fix noise.
Framing Although the stop bit must be [1], it is detected as [0].
  1. Check the communication parameters.
  2. Check the cables and wiring.
  3. Data may be disrupted because of noise. Fix noise.
Overrun After one character is received, the next character is received before internal processing is completed.
  1. Check the communication parameters.
  2. Data may be disrupted because of noise. Fix noise.
Check code error The check code in the PLC response was not correct.
  1. Check the communication parameters.
  2. Data may be disrupted because of noise. Fix noise.
Error code received An error code was sent to the link unit by the CPU of the PLC. Examine the CPU error code and solve the problem.
Break The PIC’s SD (TXD) remains at the low level. Examine the connection between the PLC’s SD (TXD) and the V7’s RD (RXD).
Invalid memory (applicable to Mitsubishi CPU) You specified an address that exceeds the memory range of the PLC that you are linked to. Check the type and range of memory that you set.
Invalid CPU model (applicable to Mitsubishi CPU) The PLC currently being supported does not have a corresponding CPU. Confirm whether or not the CPU that you are using can be used with the V series.
Format The code of the received data is invalid. Check 1, 2, 3 as described below.
Compare (applicable to HIDIC S10) Transmission data and received data are different. Check 1, 2, 3 as described below.
NAK (applicable to Allen-Bradley PLC) A NAK code is received. Check 1, 2, 3 as described below.
TNS discrepant (applicable to Allen-Bradley PLC) Transmitted TNS data and received TNS data are not in agreement. Check 1, 2, 3 as described below.
Communication error An unclear communication error is detected. Check 1, 2, 3 as described below.
Count error (applicable to Mitsubishi CPU and Q link unit) The expected data amount is different from the count value. Check 1, 2, 3 as described below.
Command error (applicable to Mitsubishi CPU /Q link unit) The response code differs from the expected code. Check 1, 2, 3 as described below.
Invalid cassette (applicable to Mitsubishi A CPU) This cassette is not included in the memory cassettes currently being supported. Contact your local distributor.
Password error (applicable to Mitsubishi QCPU) The password is incorrect. Contact your local distributor.
Check I/F driver (for simulator I/F driver) Although a request to send is given to the computer (simulator), no answer is returned within the specified time. If a simulator is not used, transfer the I/F driver for PLC again.

Solutions:

  1. Confirm link unit settings, then cycle power
  2. Confirm communications settings in V-SFT
  3. If the errors only occur occasionally, there may be a noise issue. Check grounding and shielding.