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Entry type: FAQ Entry ID: 103709414, Entry date: 03/18/2019
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How many licenses are required for the Modbus/TCP block in the S7-300/S7-400?

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Licenses for the Modbus/TCP block in the S7-300/S7-400.

All licenses are CPU-specific and cannot be transferred from one CPU to another. The Modbus/TCP can also be operated without a license for test purposes.

The licenses below are available for the Modbus/TCP blocks in the S7-300/S7-400.

  1. Modbus/TCP CP
    Single License
    Article number: 2XV9450-1MB00, 6AV6676-6MB00-6AX0, 6AV6676-6MB00-6AD0
    Modbus communication via CP
    Valid for 1 CPU
    independent of the number of slotted CPs and connected devices
  2. Modbus/TCP CP Red
    Single License
    Article number: 6AV6676-6MB30-3AX0, 6AV6676-6MB30-3AD0, 6AV6676-6MB30-4AX0, 6AV6676-6MB30-4AD0
    Redundant Modbus communication via CPs for S7-400(H) and S7-300
    Valid for 1 CPU pair in the H system or 1 single CPU with CPs
    independent of the number of slotted CPs and connected devices
  3. Modbus/TCP PN-CPU
    Single License
    Article number: 2XV9450-1MB02, 6AV6676-6MB20-3AX0, 6AV6676-6MB20-3AD0
    Modbus communication via the integrated PROFINET interface
    Valid for 1 CPU
    independent of the number of connected devices
  4. Modbus/TCP PN Red
    Single License
    Article number: 6AV6676-6MB10-0AX0, 6AV6676-6MB10-0AD0
    Redundant Modbus communication via the integrated PROFINET interface of the S7-400(H) and S7-300 CPU
    Valid for 1 CPU pair in the H system or 1 single CPU
    independent of the number of connected devices
  5. Modbus/TCP 20 SENTRON PAC
    Single License
    Article number: 6AV6676-6MA30-0AX0
    Communication via the integrated PROFINET interface for reading out values from SENTRON PAC 3200 devices and SENTRON PAC 4200 devices
    Valid for 1 CPU
    for connecting a maximum of 20 PAC devices
  6. Modbus/TCP 100 SENTRON PAC
    Single License
    Article number: 6AV6676-6MA30-1AX0
    Communication via the integrated PROFINET interface for reading out values from SENTRON PAC 3200 devices and SENTRON PAC 4200 devices
    Valid for 1 CPU
    for connecting a maximum of 100 PAC devices
  7. Modbus/TCP 512 SENTRON PAC
    Single License
    Article number: 6AV6676-6MA30-2AX0
    Communication via the integrated PROFINET interface for reading out values from SENTRON PAC 3200 devices and SENTRON PAC 4200 devices
    Valid for 1 CPU
    for connecting a maximum of 512 PAC devices


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