Omron SYSMAC CPM2B Operation Manual page 96

SR Area
Word(s) Bit(s)
SR 253 00 to 07 FAL Error Code
The error code (a 2-digit number) is stored here when an error occurs. The FAL number is
stored here when FAL(06) or FALS(07) is executed. This word is reset (to 00) by execut-
ing a FAL 00 instruction or by clearing the error from a Programming Device.
08 Battery Error Flag
Turns ON when the CPU Board backup battery's voltage is too low.
09 Cycle Time Overrun Flag
Turns ON when a cycle time overrun occurs (i.e., when the cycle time exceeds the maxi-
mum cycle time set in the PLC Setup).
10,11 Not used.
12 Changing RS-232C Setup Flag
Turns ON when the RS-232C port's settings are being changed.
13 Always ON Flag
14 Always OFF Flag
15 First Cycle Flag
Turns ON for 1 cycle at the start of operation.
SR 254 00 1-minute clock pulse (30 seconds ON; 30 seconds OFF)
01 0.02-second clock pulse (0.01 second ON; 0.01 second OFF)
02 Negative (N) Flag
Turns ON when the result of a calculation is negative (leftmost bit of binary result ON.)
03 Not used.
04 Overflow (OF) Flag
Turns ON when an overflow occurs in a signed binary calculation.
05 Underflow (UF) Flag
Turns ON when an underflow occurs in a signed binary calculation.
06 Differential Monitor Complete Flag
Turns ON when differential monitoring is completed.
07 STEP(08) Execution Flag
Turns ON for 1 cycle only at the start of process based on STEP(08).
08 to 15 Not used.
SR 255 00 0.1-second clock pulse (0.05 second ON; 0.05 second OFF)
01 0.2-second clock pulse (0.1 second ON; 0.1 second OFF)
02 1.0-second clock pulse (0.5 second ON; 0.5 second OFF)
03 Instruction Execution Error (ER) Flag
Turns ON when an error occurs during execution of an instruction.
04 Carry (CY) Flag
Turns ON when there is a carry in the results of an instruction execution.
05 Greater Than (GR) Flag
Turns ON when the result of a comparison operation is "greater."
06 Equals (EQ) Flag
Turns ON when the result of a comparison operation is "equal," or when the result of an
instruction execution is 0.
07 Less Than (LE) Flag
Turns ON when the result of a comparison operation is "less."
08 to 15 Not used.
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Note DM 6601 in the PLC Setup can be set to maintain the previous status of the
Forced Status Hold Bit (SR 25211) and the I/O Hold Bit (SR 25212) when
power is turned OFF. Refer to 4-5 PLC Setup for details.
Function
Section 4-3
Read/
write
Read-
only
Read/
write
Read-
only
Read-
only
Read-
only
Read-
only