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Chapter 3. Program Data
3.8 System Status References
System status references in the CPU are assigned to %S, %SA, %SB, and %SC memory. The four
timed contacts (time tick references) include #T_10MS, #T_100MS, #T_SEC, and #T_MIN. Examples of
other system status references include #FST_SCN, #ALW_ON, and #ALW_OFF
Note: %S bits are read-only bits; do not write to these bits. However, you can write to %SA, %SB,
and %SC bits.
Listed below are available system status references that can be used in an application program.
When entering logic, either the reference or the nickname can be used. Refer to Chapter 9 for
detailed fault descriptions and information on correcting faults.
GFK-2950C
February 2018
45
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