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A network of GCM-86000s with EtherNet NIMs does not have bi-directional communications between all GCM/ NIMs

Issue

A network of GCM-86000s with EtherNet NIMs does not have bi-directional communications between all GCM/ NIMs. It is a shared network with routers. Some symptoms reported include:

  1. A GCM/ NIM may be able to send to some GCM/ NIMs, but not to others.
  2. A GCM/ NIM may be able to receive data from some GCM/NIMs, but not from others.
  3. A GCM/ NIM may be able to send to a GCM/NIM, but not receive data from that GCM/NIM.
  4. You might be able to "ping" all GCM/NIMs on the network, and ACCESS all of them from the GCM menu, but still have issues as in 1-3 above.

Issue

TAC IA Series

Environment

  • GCM-86000 series (including LNC-100, SIM-CCN, SIM-MTECH, SIM-TRANE, and SIM-YORK)
  • EtherNet NIM (GCM-ETH-001)
  • Shared (customer's) EtherNet LAN with routers

Cause

In the NIM block of one or more of the affected GCM/ NIMs, the IP Multicast address (IPMLT) is set incorrectly. In the following example, the NIM block parameters were taken from a network of four GCM/NIMs, experiencing all four of the issues noted above.

 

 

GCM#1 GCM#2 GCM#3 GCM#4

 

5.4A 5.3A 5.4A 5.4A

 

11.2T 11.2T 11.2T 11.2T
PNLIP 010.020.000.028 010.020.000.019 010.020.004.008 010.020.004.009
RTRIP 010.020.000.001 010.020.000.001 010.020.000.001 010.020.000.001
DIRSV 010.020.000.028 010.020.000.028 010.020.000.028 010.020.000.028
ETHML 01.20.96.01.00.00 01.20.96.01.00.00 01.20.96.01.00.00 01.20.96.01.00.00
IPMLT 010.020.000.019 010.020.000.019 010.020.000.019 010.120.000.019
IPSUB 255.255.000.000 255.255.000.000 255.255.000.000 255.255.000.000
UDPPT 1235 1235 1235 1235

Resolution

On a shared network with routers, the IP Multicast address (IPMLT) should be the same as the Panel IP address (PNLIP);
IPMLT = PNLIP.

  1. Using the appropriate FLASH clear procedure, and set the NIM block parameters so that IPMLT = PNLIP. In the example below, make the changes to the IPMLT as high-lighted in yellow.

 

GCM#1 GCM#2 GCM#3 GCM#4
GCM Rev. 5.4A 5.3A 5.4A 5.4A
NIM Rev. 11.2T 11.2T 11.2T 11.2T
PNLIP 010.020.000.028 010.020.000.019 010.020.004.008 010.020.004.009
RTRIP 010.020.000.001 010.020.000.001 010.020.000.001 010.020.000.001
DIRSV 010.020.000.028 010.020.000.028 010.020.000.028 010.020.000.028
ETHML 01.20.96.01.00.00 01.20.96.01.00.00 01.20.96.01.00.00 01.20.96.01.00.00
IPMLT 010.020.000.028 010.020.000.019 010.020.004.008 010.020.004.009
IPSUB 255.255.000.000 255.255.000.000 255.255.000.000 255.255.000.000
UDPPT 1235 1235 1235 1235

See the Nim Networking and Configuration Guide, F-25955-4, Chapter 2, "GCM Shared Network Address Guidelines (Routed Network)" for details.

  1. For EtherNet NIMs with firmware revisions 11.2P or 11.2T, see "Special NIM Address Switch Functions" for the REVISED FLASH clear procedure.
  2. For EtherNet NIMs with firmware revisions 11.1F or earlier, see "Flash clear" procedure for GCM Ethernet NIMs (GCM-ETH-001) with firmware prior to revision 11.2P.
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Last update:
3 weeks ago
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