11. Connection to other devices11.4 Modbus TCP11.4.4 Modbus mapFunction codeModbusModbusreg. #Operand Description Remark0x01(Read Coil)Max. 512 coils atonce,8 coils aregrouped into abyte1 Q1 Bit output 1 Local outputs base device… … …4 Q4 Bit output 417 Q17 ExpansionBit outputLocal outputs expansion… … …128 Q128 ExpansionBit output1001 M1 Marker bit 1... … …1512 M512 Marker bit 5122001 N1 NET marker bit 1 Only the local NET marker bitsare returned… … …2512 N512 loc. NET marker bit 5120x03(Read HoldingRegister)Max. 125 registersat once,1 register =2 byte/1word1 QA1 16-bit analog output 1 Local analog outputs basedevice… … …4 QA4 16-bit analog output 45 QA5 Expansion 16-bit analogoutputLocal analog outputs expansion… … …148 QA48 Expansion 16-bit analogoutput1001 MW1 Marker word 1… … …1512 MW512 Marker word 5122001 NW1 loc. Net marker word 1 Only local NET marker wordswill be returned, i.e., no doublewords, no bytes, and no mark-ers from the other stations willbe returned… … …2032 NW32 NET marker word 325000 RTC (second) 5000: Seconds; 5001: Minutes;5002: Hours; 5003: Day; 5004:Month; 5005: Year…. … …5005 RTC (year)Table 105: How the Modbus registers and read data for the Modbus server are mapped easyE4 control relayseasyE4 11/18 MN050009 EN www.eaton.com 557
