Woodward MRM4, Manual

Page: 209 / 460

Communication Protocols
Based on the IRIG STANDARD 200-04, the device interface and software provides all time synchronization
formats IRIG-B00X (IRIG-B000 / B001 / B002 / B003 / B004 / B005 / B006 / B007) as described in the standard.
IRIG-B004 and higher will support/transmit the “year” information.
Time code B has a time frame of 1 second with an index count of 10 milliseconds and contains time-of-year and
year information in a binary code decimal (BCD) format, and seconds-of-day in straight binary seconds (SBS)
format.
Time accuracy of ±1ms is a requirement to synchronize the different protection devices. This can be achieved
by means of IRIG-B.
The location of the IRIG-B interface depends to the device type. Please see the wiring diagram supplied with the
protective device.
Function
The following IRIG-B parameters can be set within the Device Parameters menu.
•
Set the IRIG-B type (choose B000 through B007).
•
Set the time synchronization via IRIG-B to Active or Inactive.
•
Set the time zone parameter (choose one of the 36 UTC Time Zones).
•
Activate or deactivate the “Daylight Savings Time” function.
Parameter for Daylight Savings Time (summer-winter time) has to be set
manually.
Check the wiring (wiring error) if no IRIG signal can be detected.
A signal will be issued if no IRIG-B time code is received for longer than 60 s.
IRIG-B Control Commands
In addition to the date and time information, the IRIB-B code offers the option to transmit up to 18 control
commands that can be processed by the protective device. They have to be set and issued by the Time Code
Generator.
The protective devices offer up to 18 IRIG-B assignment options for those control commands in order to carry
out the assigned action. That means if the IRIG-B time code is fed with the corresponding state of those control
commands, than they can be used for further processing within the devices (e.g.: in order to start statistics,
switch on or off street lighting).
Device Planning Parameters of the IRIG-B00X
Parameter Description Options Default Menu path
Mode Mode do not use,
use
use [Device planning]
EN MRM4 01/11 Page 209