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User's Manual
 Environment Setting Section > Methods for Connecting and Communicating with External Devices > Communicating through Serial Communication (PLC Link) > Setting Communication Specifications (RS-232C/422-PLC Link)

Setting Communication Specifications (RS-232C/422-PLC Link)

Communication specifications such as link areas or communication speed and data length are set.
Setting Communication Specifications (Ethernet - PLC Link)
Important
  • Before setting the communication specifications, set the "Serial (RS-232C/422)" communication module to "PLC link (SYSMAC CS/CJ/CP/One)" (or to "PLC link (MELSEC Q series)" (FZ3-9IconIcon/H9IconIcon only) in the case of a PLC by Mitsubishi Electric Corporation), save the setting to the controller, and then restart the system. When the system is restarted, the communication settings are initialized.
    Setting the Start-up Status [Startup Setting]
  • Use the same communication specification settings for the controller and the external device.
  • If the operation mode (FZ3-9IconIcon/H9IconIcon only) is [Multi-line random-trigger mode], "RS232C/422-PLC link" cannot be selected for line 1.
  1. On the Main screen, tap the [System] menu - [Communication] - [Serial] - [RS-232C/RS-422].
    The serial interface window is displayed.
  2. In the communication setting area, set the following items.
    Serial interface - Communication settings
    Setting item
    Setting value
    [Factory default]
    Description
    Interface
    • [RS-232C]
    • RS-422 [Note 3]
    Adjust to the PLC communication specifications.
    Band rate [bps][Note 1]
    • 2400
    • 4800
    • [9600]
    • 19200
    • 38400
    • 57600
    • 115200
    Adjust to the PLC communication specifications.
    Data length [bit] [Note 2]
    • [7]
    • 8
    Adjust to the PLC communication specifications.
    Parity
    • None
    • Odd
    • [Even]
    Stop bit [bit]
    • 1
    • [2]
    Flow control
    [None]
    Flow control is not performed with software.
    If the time in which there is no response from external devices reaches the timeout setting time, a timeout error occurs and an error message is displayed in the window. The parallel interface ERROR signal also turns on.
    Xon/Xoff
    Flow control is performed with software. Data is sent according to the Xon/Xoff codes from external devices.
    Timeout [s]
    1 to 120
    [5]
    Set the time in which a timeout error will occur in seconds.
    [Note 1]: If a speed of [38400 bps] or higher is selected, effective communication cannot be guaranteed depending on the cable length because speeds of over 20 kbps are not defined in RS-232C standards. In this case, set the communication speed at [19200 bps] or lower.
    [Note 2]: With the RS-232C MELSEC Q series, set the data length to 8.
    [Note 3]: With the MELSEC Q series, RS-422 cannot be used.
  3. Tap [PLC Link setting].
    The PLC Link Setting window is displayed.
  4. Set the following items.
    Serial interface - PLC link setting
    Setting item
    Setting value
    [Factory default]
    Description
    Command area
    Area
    • [CIO Area (CIO)]
    • Work Area(WR)
    • Holding Bit Area(HR)
    • Auxiliary Bit Area (AR)
    • DM Area (DM)
    • EM Area(EMO)
    Set the Command area.
    Address
    0 to 99999
    [0]
    Set the top channel address in the Command area.
    Response area
    Area
    • [CIO Area (CIO)]
    • Work Area(WR)
    • Holding Bit Area(HR)
    • Auxiliary Bit Area (AR)
    • DM Area (DM)
    • EM Area(EMO)
    Set the Response area.
    Address
    0 to 99999
    [100]
    Set the top channel address in the Response area.
    Data output area
    Area
    • [CIO Area (CIO)]
    • Work Area(WR)
    • Holding Bit Area(HR)
    • Auxiliary Bit Area (AR)
    • DM Area (DM)
    • EM Area(EMO)
    Set the Data output area.
    Address
    0 to 99999
    [200]
    Set the top channel address in the Data output area.
    Output control
    (FZ3-9IconIcon/H9IconIcon only)
    • None
    • [Handshaking]
    Set whether or not to provide an interlock with the PLC when performing data output.
    None: Data is output regardless of the status of signals from the PLC. GATE is always OFF.
    Handshaking: Data is output after confirming DSA from the PLC.
    Retry interval [ms]
    1000 to 999999
    [10000]
    Set the communication retry interval.
    PLC by Mitsubishi Electric Corporation (FZ3-9IconIcon/H9IconIcon only)
    Serial interface - PLC link setting
    Setting item
    Setting value
    [Factory default]
    Description
    Command area
    Area
    • [Data register]
    • File register
    • Link register
    Set the Command area.
    Address
    0 to 99999
    [0]
    Set the top channel address in the Command area.
    Response area
    Area
    • [Data register]
    • File register
    • Link register
    Set the Response area.
    Address
    0 to 99999
    [100]
    Set the top channel address in the Response area.
    Data output area
    Area
    • [Data register]
    • File register
    • Link register
    Set the Data output area.
    Address
    0 to 99999
    [200]
    Set the top channel address in the Data output area.
    Output control
    • None
    • [Handshaking]
    Set whether or not to provide an interlock with the PLC when performing data output.
    None: Data is output regardless of the status of signals from the PLC. GATE is always OFF.
    Handshaking: Data is output after confirming DSA from the PLC.
    Retry interval [ms]
    1000 to 999999
    [10000]
    Set the communication retry interval.
  5. Tap [OK].
    The settings are confirmed and the serial interface window closes.

Checking Communication Status

Use PLC tools, etc. to check the communication status.
　　
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