KM-RIO Installation and Operation Manual - Kistler-Morse

Chapter 3. PLC ProgrammingChapter 3. PLC ProgrammingIntroductionThe chapter documents the format for K-M’sprogram commands for interfacing with A-B’sPLC network. This material is written forusers who have experience with A-B’s PLCprogramming and have A-B PLC programmingdocumentation available for reference. Referto the appropriate K-M manual(s) for yourK-M product(s). These manuals providecomplete installation, operation, and calibrationprocedures, and product specifications.The KM-RIO provides an interface for weight,level, and flow systems into the A-B RemoteI/O network. This chapter documents theformat for the commands and contains themiscellaneous system commands for theKM-RIO. The actual commands for each K-Msignal processor supported by the KM-RIOare in the following chapters:• KM-RIO/Sonologic 5000 Series-ITU-SSU— Chapter 4• KM-RIO/STX Signal Transmitter —Chapter 5• KM-RIO/Models 1000 and 1020 —Chapter 6• KM-RIO/Sonologic II & ultra-wave —Chapter 7• KM-RIO/Weigh II — Chapter 8• KM-RIO/SVS 2000 — Chapter 9The KM-RIO supports block or discretetransfer capability. For both block anddiscrete transfer, only one KM-RIO channelcan be assigned to each signal processorchannel. The three versions of the KM-RIOhave the following capacities:1. Block Transfer(refer to Figures 3-1A, 3-2, and 3-3)• KM1-RIO: two words, 16 bits perword, two words allocated for eachKM-RIO channel, and a capacity ofone channel.• KMM-RIO-1: 64 words, 16 bits perword, two words allocated for eachKM-RIO channel, and a capacity ofup to 32 channels.• KMM-RIO-2: 128 words, 16 bits perword, two words allocated for eachKM-RIO channel, and a capacity ofup to 64 channels.3-12. Discrete Transfer(refer to Figures 3-1B and 1-1)• KM1-RIO: two words, 16 bits perword, and a capacity of one channel.• KMM-RIO-1: eight words, 16 bitsper word, and a capacity of up tosix channels.• KMM-RIO-2: 16 words, 16 bitsper word, and a capacity of up to12 channels.Setting the jumpers for block or discretetransfer programming is described inChapter 2, Hardware Setup.KM-RIO BlockTransfer CommandsThis section describes the table structures,commands, and channel status reports forblock transfer. Follow the procedure inChapter 2, Hardware Setup, to set theKM-RIO PCB for block transfer programming.The PLC processor transfers data to and fromthe KM-RIO using BTW (Block TransferWrite) and BTR (Block Transfer Read)instructions in your ladder logic program.The data obtained from the KM-RIO usingBTR is set up by instructions sent by BTWcommands. Figure 3-2 shows the BTW bit/word configuration. The first word of eachchannel is the data word. Data is placed hereif the command is to send data from the PLCto the KM-RIO. The second word of eachchannel is the command word, which mayinclude subcommands and additional data(if the data could not fit within the 16 bits ofthe first word). Bit 15 of the command word iscalled the Write Bit. Bit 15 is set to ‘1’ whenthe command is to send data from the PLCto the KM-RIO. Bit 15 is set to ‘0’ when thecommand is to send data from the KM-RIO tothe PLC. After the BTW instruction has beencompleted, a BTR instruction is used.