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STBNIP2212 Loses Modbus Communications Under a Specific Condition

Issue
The purpose of this resolution is to inform users of STB Ethernet NIM's (Modbus TCP and Ethernet/IP) of a communication issue that may occur under a specific condition.

If an STBNIP2212 was powered on for 828 consecutive days, it would lose Modbus communications for 20 minutes, recover on its own and will not fault again with this behavior for another 828 days

The 828 consecutive days powered on relates to an internal clock value in the STBNIP2212. When this specific clock value is reached, an issue occurs with the ARP cache creating a 20-minute Modbus TCP communication loss. After this 20-minute period, the communications will recover on its own. ICMP service may or may not be immediately affected by this event but will recover at the same time as Modbus TCP communications.

If at any time, the NIP is power cycled, its clock count value resets to zero and starts a new 828-day operating period. This can be done during any scheduled maintenance period within the 828-day time frame to avoid this event.


Product Line

  • STBNIP2212 RoHs versions
    (RoHs versions are identified with an SV equal to or greater than 2.70)
    RoHs is the acronym for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic PRODUCTS. The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE).
  • STBNIP2212 non-RoHs versions
    (non-RoHs versions are identified with an SV less than 2.70)
  • STBNIC2212

Resolution
New firmware fixes each of the 3 affected products:
  • STBNIP2212 RoHs firmware versions 2.38 and higher.
  • STBNIP2212 non-RoHs firmware versions 3.31 and higher.
  • STBNIC2212 firmware versions 3.30 and higher.


Legacy KB System (APS) Data: RESL212447 V2.0, Originally authored by DaDz on 09/06/2013, Last Edited by DaDz on 09/18/2013
Related ranges: Modicon STB

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