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Appendix DMemory Areas
455
Word(s) FunctionBit(s)
254 00 1-minute clock pulse bit
01 0.02-second clock pulse bit
02 and 03 Reserved for function expansion. Do not use.
04 Overflow Flag (for signed binary calculations)
05 Underflow Flag (for signed binary calculations)
06 Differential Monitor End Flag
07 Step Flag
08 MTR Execution Flag
09 7SEG Execution Flag
10 DSW Execution Flag
11 Interrupt Input Unit Error Flag
12 Reserved by system
13 Interrupt Programming Error Flag
14 Group-2 High-density I/O Unit Error Flag
15 Special Unit Error Flag (Special I/O, PC Link, Host Link, Remote I/O Master)
255 00 0.1-second clock pulse bit
01 0.2-second clock pulse bit
02 1.0-second clock pulse bit
03 Instruction Execution Error (ER) Flag
04 Carry (CY) Flag
05 Greater Than (GR) Flag
06 Equals (EQ) Flag
07 Less Than (LE) Flag
08 to 15 Reserved by system (used for TR bits)
256 to 261 00 to 15 Reserved by system
262 00 to 15 Longest interrupt subroutine (action) execution time (0.1 ms)
263 00 to 15 Number of interrupt subroutine (action) with longest execution time.
(8000 to 8512) 8000 to 8007, 8099
Bit 15: Interrupt Flag
264
00 to 03 RS-232C Port Error Code
0: No error
2: Framing error
1: Parity error
3: Overrun error
04 RS-232C Port Communications Error
05 RS-232C Port Send Ready Flag
06 RS-232C Port Reception Completed Flag
07 RS-232C Port Reception Overflow Flag
08 to 11 Peripheral Port Error Code in General I/O Mode
0: No error
2: Framing error
F: When in Peripheral Bus Mode
1: Parity error
3: Overrun error
12 Peripheral Port Communications Error in General I/O Mode
13 Peripheral Port Send Ready Flag in General I/O Mode
14 Peripheral Port Reception Completed Flag in General I/O Mode
15 Peripheral Port Reception Overflow Flag in General I/O Mode
265 00 to 15 RS-232C Port Reception Counter in General I/O Mode
266 00 to 15 Peripheral Reception Counter in General I/O Mode (BCD)