Technical information

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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 BMX NOE 0100/0110 Ethernet module or the
BMX NOC 0401 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
BMX NOE 0100/0110, BMX NOC 0401 and BMX NOR 0200H 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.
a
NIM network module for
Modicon STB I/O
a
NIM network module for
Modicon STB I/O
Modicon M340 automation
platform
Ethernet Modbus/TCP network
Ethernet Modbus/TCP communication services
Processors:
page 1/2
I/O:
pages 2/2 and 2/14
Software:
page 4/2
Ruggedized Modicon M340 modules:
page 6/2
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