ＦＬ３１００是火焰探测系统modbus master，PLC３００作为modbus master 通讯连不上。在线诊断如下： Diagnostic buffer of module CPU 315-2 DP Order No./ Des cription Component Version 6ES7 315-2AG10-0AB0 Hardware 3 - - - Firmware V 2.0.8 Rack: 0 Slot: 2 Event 1 of 10: Event ID 16# 2942 I/O access error, reading P area, word access, Access address: 6 Requested OB: I/O access error OB (OB122) Priority class: 1 External error, Incoming event 12:25:24:196 pm 07/22/04 Event 2 of 10: Event ID 16# 2522 Area length error when reading Instance DB, word access, Access address: 2 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:196 pm 07/22/04 Event 3 of 10: Event ID 16# 2522 Area length error when reading Instance DB, byte access, Access address: 58 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:195 pm 07/22/04 Event 4 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 24 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:195 pm 07/22/04 Event 5 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 34 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:194 pm 07/22/04 Event 6 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 22 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:193 pm 07/22/04 Event 7 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 16 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:193 pm 07/22/04 Event 8 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 14 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:192 pm 07/22/04 Event 9 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 12 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:192 pm 07/22/04 Event 10 of 10: Event ID 16# 2523 Area length error when writing Instance DB, word access, Access address: 10 Requested OB: Programming error OB (OB121) Priority class: 1 Internal error, Incoming event 12:25:24:191 pm 07/22/04 以前没有接触过，又比较着急，各位大虾帮帮忙。在下不胜感激！