256 Rockwell Automation Publication 1444-UM001D-EN-P - June 2018
Chapter 10 Operate the Module
Default Gateway Address
The gateway
(1)
address is by default 192.168.1.1. However, if a Static IP
address is used and set to that same address, then the gateway address defaults
to 0.0.0.0.
Time Management
The Dynamix 1444 Series modules include an onboard real-time clock
(2)
. The
clock, which has a maximum drift accuracy of 100 ms per year, maintains time
in Coordinated Universal Time
(3)
(UTC) format. The clock is set by
synchronizing with the controller time and uses the IEEE-1588 standard
version 2 based CIP Sync protocol.
The Dynamix 1444 primarily uses time for captured data. This data includes
event log entries, demand data, trend, and alarm trend data and transient data.
It also stamps the current time to any “live” FFT and TWF data returned as
“live” data by the Normal CM Object. Data that are returned on the input
assembly of the controller are not time-stamped. Consequently, if the module
is used only to serve “level” data to the controller or other devices, then it is not
always required to manage accurate time.
While CIP Sync is designed to update time continuously (synchronize)
between the controller and the module, continuous synchronization with the
controller is not required. Once the time is set in the module, it retains that
time until the next power cycle. Consequently, if communication with the
controller is lost, the module continues to manage and report accurate time.
(1) A gateway connects individual physical networks into a system of networks. When a node must communicate with a node on
another network, a gateway transfers the data between the two networks.
(2) Module Time is a 64-bit integer value in units of microseconds with a power-up value of 0, which corresponds to an epoch of
January 1, 1970.
(3) Coordinated Universal Time (UTC) is the time standard for `civil time’, and represents time at the Prime Meridian. The time
excludes time zone or daylight savings time offsets. Module Time is based on UTC.
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