Omron CPM2C-S100C Operation Manual page 116

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 exe-
cuting a FAL 00 instruction or by clearing the error from a Programming Device.
08 Battery Error Flag
Turns ON when the CPU Unit 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 100 ms).
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
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.
94
Note DM 6601 in the PC 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.
Function
Section 4-4
Read/
write
Read-
only
Read/
write
Read-
only
Read-
only
Read-
only