Simatic Fetch/Write

  • Fetch/Write (ISO-on-TCP RFC 1006)

    The protocol Simatic Fetch/Write enables the connection of S7 automation devices with any communication partner. It provides direct access to the S7 user memory without changes in the user application itself, if applicable.

    Only a communication unit (CP) for Ethernet connection or alternatively an onboard Ethernet interface that supports ISOonTCP (RFC1006) as well as the protocol Simatic Fetch/Write must be available.

    An onboard Ethernet interface requires the development of special function modules for the communication in addition to the S7 user program. This is not necessary with an external communication unit (CP).

    ISO - OSI classification
    chart: ISO - OSI classification

    The SIMATIC® S7 series supports the services FETCH and WRITE via the protocol ISO-on-TCP only in passive mode, i.e. it operates as a server and does not establish communications links spontaneously.

    To address all internal data on the PLC side, the S7 Protocol (RFC 1006) can be used, not restricting access to data blocks (DB).

ISO/OSI Model
7 Application Layer Fetch Read / Fetch Write
6 Presentation Layer n/a
5 Session Layer n/a
4 Transport Layer ISO-on-TCP (RFC 1006)
TCP (RFC 793)
3 Network Layer IP (RFC 791)
2 Link Layer IP (RFC 894)
1 Physical Layer Ethernet (IEEE 802.3)
Available Protocol Stacks

Simatic Fetch/Write, Master

Applicable Products
  • ipConv
    ipConv

    Universal protocol converter for highest degree of flexibility

    Flyer
  • ipConvLite
    ipConvLite

    Universal protocol converter for small and distributed applications

    Flyer
  • ipConvLite/MEC2PBS
    ipConvLite/MEC2PBS

    Universal protocol converter with integrated PROFIBUS-DP, slave interface

    Flyer
  • ipConvLite/MEC2PBM
    ipConvLite/MEC2PBM

    Universal protocol converter with integrated PROFIBUS-DP, master interface

    Flyer
  • ipConvLite/MEC2PNS
    ipConvLite/MEC2PNS

    Universal protocol converter with integrated PROFINET-IO, slave interface

    Flyer
  • ipConvOPC
    ipConvOPC

    Windows software package for universal conversion between diverse standard protocols

    Flyer
  • ipConv/VM
    ipConv/VM

    Universal protocol conversion for VMware Workstation and VMware ESXi

    Flyer
  • ipConv/Cloud
    ipConv/Cloud

    Universal protocol conversion for the cloud environment or Linux based edge devices

  • ip4Cloud
    ip4Cloud

    Link critical processes securely to IT/Cloud/SCADA services

    Flyer
  • ip4Cloud/SEC3PB
    ip4Cloud/SEC3PB

    Capture PROFIBUS data by eavesdropping and transmit it to Cloud/IT or SCADA services

    Flyer
  • ip4Cloud/SEC3IO
    ip4Cloud/SEC3IO

    Switch and monitor digital I/O states to transmit them to IT/Cloud/SCADA services

    Flyer
  • ipELB
    ipELB

    4-Port Ethernet Line Breaker with relay controlled Ethernet ports and integrated I/O module

    Flyer
References
  • ICESA S7
    ICESA S7, Spain

    Products: ipConvLite
    Protocol Stacks: IEC 60870-5-104, Slave Simatic Fetch/Write, Master

  • Simatic Fetch/Write - IEC 104
    Simatic Fetch/Write - IEC 104, Italy

    Products: ipConvLite
    Protocol Stacks: IEC 60870-5-104, Slave Simatic Fetch/Write, Master