Modicon M340 Plc Page 2-13 Communication

2/13 Functions (continued) Functions (continued) FDR (Faulty Device Replacement) service The Faulty Device Replacement service uses standard address management technologies (BOOTP, DHCP) and the TFTP (Trivial File Transfer Protocol) file management service, with the aim of simplifying maintenance of Ethernet devices. The FDR service is used to replace a faulty device with a new device with the guarantee that it will be detected, reconfigured and automatically rebooted by the system. The main steps in replacement are: 1 A device using the FDR service malfunctions. 2 Another similar device is taken from the maintenance store, preconfigured with the Device name for the faulty device, then reinstalled on the network. Depending on the device, addressing can be performed using rotary selector switches (as for Modicon STB distributed I/O a, or Modicon OTB for example) or can be given using the keypad integrated in the device (as for Altivar variable speed drives for example). 3 The FDR server detects the new device, allocates it an IP address and transfers the configuration parameters to it. 4 The substituted device checks that all these parameters are indeed compatible with its own characteristics and switches to operational mode. The FDR server can be the BMXNOE0100/0110 Ethernet module or the BMXNOC0401 module. NTP time synchronization service Presentation BMX CPS power supply Processor BMX NOE module Internal clock Ethernet network NTP server Modicon M340 NTP response NTP request NTP client The time synchronization service is based on NTP (Network Time Protocol) which is used to synchronize the time of a client or a server on Ethernet from a server or another reference time source (radio, satellite, etc). Operation BMXNOE0100/0110 , BMXNOC0401 and BMXNOR0200H Ethernet Modbus/TCP modules have an NTP client component. These modules connect to an NTP server using a client request ( Unicast ) in order to update their local time. The module clock is updated periodically (1 to 120 s) with typical precision of 5 ms. If the NTP server cannot be reached, the Ethernet TCP/IP module switches to a standby NTP server. The PLC processor clock is therefore itself updated with a precision of 5 ms. A function block is used to read this clock, thus enabling Unity Pro application events or variables to be time and date stamped. The Ethernet module is configured by means of a Web page. The time zone can be configured. A time synchronization service (NTP) diagnostic Web page is also available. Information on the time synchronization service (NTP) is also available in the Transparent Ready private MIB, which can be accessed via the SNMP network management service. Modicon M340 automation platform Ethernet Modbus/TCP network Ethernet Modbus/TCP communication services NIM network module for Modicon STB I/O a Processors: page 1/8 Ruggedized Modicon M340 modules: page 3/2 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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