GE 90*-30 PLC Series User Manual

Also see for 90-30 PLC: Installation and Hardware Manual

Contents

1-8 Series 90™-30 PLC LONWORKS® Bus Interface Module User's Manual – June 1997 GFK-1322A1Functional CharacteristicsMost parameters are supported to the limits of the LON T ALK Protocol and the LON WORKS nodelimits.Table 1-6. LBIM Functional CharacteristicsMicroprocessor Neuron chip running the Microprocessor Interface Program(MIP) with 80C186 host processor.Maximum number of networkvariables supported by LBIM244 (240 of these can be configured by user)The maximum number of network variables depends on thesize and type of the variables, limited by the LBIM’s PLCregister space (2 Kbytes each direction) and the configurationmemory budget.Standard Network Variable Types(SNVTs)Supports LONWORKS SNVTs as listed in The SNVT MasterList published by Echelon corporation as of June 1996. Eachnetwork variable must be no more than 31 bytes in length.PLC memory types supported %I, %Q, %AI, %AQConfigurationConfiguration of the LBIM consists of defining network variable types and mapping them into thePLC reference space using the IOPEN configuration software. Network Variable types mapped tomemory types %I or %Q must be of type SNVT_switch, SNVT_lev_disc, or other bit-representedtypes. Once the LBIM’s network interface has been configured, network configuration andbinding can be performed as for any other LONWORKS node. Also, after the LBIM’s networkinterface has been configured, the Series 90-30 backplane CPU must be set up to recognize theLBIM as a foreign smart module with a reference map required to implement the networkinterface. For details on configuration, refer to Chapter 4.DiagnosticsThe LBIM does not report faults to the PLC. Module errors cause the LBIM to reset. If anacknowledge NV update command fails, it is up to the destination device to assume that a faulthas occurred. Configuration errors will cause the LBIM to not be mapped.For troubleshooting and diagnostics information, refer to Chapter 5.