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Appendix C
Error and Arithmetic Flag Operation
The following table shows the instructions that affect the ER, CY, GR, LE and EQ flags. In general, ER indicates
that operand data is not within requirements. CY indicates arithmetic or data shift results. GT indicates that a com-
pared value is larger than some standard, LT that it is smaller, and EQ, that it is the same. EQ also indicates a result
of zero for arithmetic operations. Refer to
Section 5 Instruction Set
for details.
Vertical arrows in the table indicate the flags that are turned ON and OFF according to the result of the instruction.
Although ladder diagram instructions,TIM, and CNT are executed when ER is ON, other instructions with a vertical
arrow under the ER column are not executed if ER is ON. All of the other flags in the following table will also not
operate when ER is ON.
Instructions not shown do not affect any of the flags in the table. Although only the non-differentiated form of each
instruction is shown, differentiated instructions affect flags in exactly the same way.
The ER, CY, GR, LE and EQ Flags are turned OFF when END(01) is executed, so their status cannot be monitored
with a Programming Console.
Instructions 25503 (ER) 25504 (CY) 25505 (GR) 25506 (EQ) 25507 (LE) Page
TIM Unaffected Unaffected Unaffected Unaffected
139
CNT
145
END(01)
1
OFF OFF OFF OFF OFF 138
STEP(08) Unaffected Unaffected Unaffected Unaffected Unaffected 266
SNXT(09) 266
CNTR(12) Unaffected Unaffected Unaffected Unaffected 148
TIMH(15) 143
WSFT(16) 157
CMP(20) Unaffected 170
MOV(21) Unaffected Unaffected Unaffected 159
MVN(22) 159
BIN(23) 180
BCD(24) 181
ASL(25) Unaffected Unaffected 154
ASR(26) 154
ROL(27) 155
ROR(28) 155
COM(29) Unaffected Unaffected Unaffected 249
ADD(30) Unaffected Unaffected 205
SUB(31) 207
MUL(32) Unaffected Unaffected Unaffected 211
DIV(33) 212
ANDW(34) 250
ORW(35) 251
XORW(36) 252
XNRW(37) 253
INC(38) 204
DEC(39) 204
STC(40) Unaffected ON Unaffected Unaffected Unaffected 205
CLC(41) Unaffected OFF Unaffected Unaffected Unaffected 205
MSG(46) Unaffected Unaffected Unaffected Unaffected 278
ADB(50)
1
Unaffected Unaffected 219
SBB(51)
1
221