GE 90*-30 PLC Series User Manual

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

Contents

GFK-1322A Appendix C Configuration File Specifications C-3CTable C-5. PLC I/O Table ConfigurationPLC I/O Table MappingMethodDefined using Parameter 0.Reference Parameters 1 - The parameter 0 register setup will be used. In addition, an enumerated text parameter will beused as parameter 1. The text will contain: "Last Parameter"Module Input/OutputOffsets in PLC CPU I/OTablesSpecified in the custom area of the self documentation string for the node.This will consist of:. %I start, len%AI start, len%Q start, len%AQ start, len%V start, len.where:"." is the start/end of the address description"start" is the starting CPU I/O table offset for each memory type (max. 5 digits)."len" is the number of memory locations used by this module.%V specifies the start and length of the valid bit block in the %I I/O table.PLC I/O Table to NVMappingSpecified in the custom area of the self documentation string for each network variable. This willconsist of:.%mType start, len, valid, default.where:"." is the start / end of the map desc."mType" is I, Q, AI, or AQ"start" is the starting CPU I/O table offset for the memory type (max. 5 digits)."len" is the number of I/O table locations used by this NV."valid" is the %I CPU I/O table offset of the valid bit for the network variable."default" is either H or 0. This is used when the LBIM detects the network interface is down, where:H - Leave value sent to the PLC as is.0 - Set the value to the PLC to zero.Default only applies to input network variables.PLC Register to NVArray MappingAn NV array has one declaration in the .XIF file and therefore has only one mapping description inthe self-documentation string. The size of the IO Table data will be the size of the NV element timesthe number of NV array elements.Data Coherency The PLC must update all memory locations for a network variable in a single sweep to stopintermittent values from propagating over the network. Data Coherency must be maintained overeach network variable.Fast updates If the PLC updates memory locations faster than the LBIM can update the NV or the network canpropagate the NV, will result in those transitions being lost.Valid Bit Each network variable is configured to have a valid bit in the %I I/O table. For input NVs, the bitwill be set if the NV has been updated and the Max Receive Time (if set) has not expired. Foroutput NVs, the bit will be set if the NV has been propagated and a failure not been detected (mustuse acknowledged service).Module Control %Ilocations8 bits of %I registers (mapped to first location).Bit 1: LONWORKS interface running.Bit 2: Network variable mapping configured.Bits 3-8: reserved for future use