Cst Attributes - Allen-Bradley Logix5000 Reference Manual

Chapter 4 Input/Output Instructions (MSG, GSV, SSV, IOT)
Attribute Data Type
CurrentStatus INT
CurrentValue DINT[2]
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CST Attributes

The coordinated system time (CST) object provides coordinated system time for
the devices in one chassis.
Instruction Description
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.
7 Unused
8-9 00 = time dependent node
01 = time master node
10 = time relay node
11 = Unused
10-15 Unused
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.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011