202 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 4 Input/Output Instructions (MSG, GSV, SSV, IOT)
CST Attributes
The coordinated system time (CST) object provides coordinated system time for
the devices in one chassis.
Attribute Data Type Instruction Description
CurrentStatus INT GSV Current status of the coordinated system time.
Bit Meaning
0 Timer hardware faulted: the device’s internal timer hardware is in a faulted
state
1 Ramping enabled: the current value of the timer’s lower 16+ bits ramp up to
the requested value, rather than snap to the lower value.
2 System time master: the CST object is a master time source in the
ControlLogix system
3 Synchronized: the CST object’s 64-bit CurrentValue is synchronized by master
CST object via a system time update
4 Local network master: the CST object is the local network master time source
5 Relay mode: the CST object is acting in a time relay mode
6 Duplicate master detected: a duplicate local network time master was
detected.
This bit is always 0 for time-dependent nodes.
7Unused
8-9 00 = time dependent node
01 = time master node
10 = time relay node
11 = Unused
10-15 Unused
CurrentValue DINT[2] GSV Current value of the timer. DINT[0] contains the lower 32; DINT[1] contains the upper 32 bits. The
timer source is adjusted to match the value supplied in update services and from local
communication network synchronization. The adjustment is either a ramping to the requested
value or an immediate setting to the request value, as reported in the CurrentStatus attribute.
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