
89
ATM1(25) and ATM2(26) operate in the same way as TIM and TIMM(20) ex-
cept that their SVs are determined by the #1 and #2 analog timer adjust-
ments on the front of the CPU. The hardware setting is converted to BCD
and stored in dedicated word 08. The ranges within which the hardware ad-
justment operations is designated as the operand (RD) of the instruction.
These designations are shown in the following table.
RD
SV range
0000
1 to 250 seconds
0001
0.1 to 25.0 seconds
0002
0.01 to 2.50 seconds
RD can be designated either as a constant, or as the contents of a word by
designated a word address.
Both ATIM(22) and ATM1(25) are adjusted with the #1 analog timer adjust-
ment on the front of the SP16 and SP20. Although both of these instructions
can be used at the same time, their SVs cannot be adjusted independently,
although the range of the set value for ATM1(25) can be controlled as de-
scribed above. ATM2(26) is adjusted with the #2 analog timer adjustment
and can thus be set independently from other timers.
Refer to 3-7-14 TIMER - TIM for other operational details and examples. Ex-
cept for the above, and all aspects of operation are the same.
Timers in interlocked program sections are reset when the execution condi-
tion for IL(02) is OFF. Power interruptions also reset timers. If a timer not re-
set under these conditions is desired, clock pulse bits can be counted to pro-
duce timers using CNT. Refer to 3-7-19 COUNTER - CNT for details.
The SV of the analog timer can vary up to 10% with changes in the ambient
temperature.
Flags
ER:
The Error Flag (0311) will be turned ON when the RD contained in a
word is not BCD. The instruction will be executed, but operation will
not be reliable.
3-7-19
COUNTER - CNT
N: TC number
# (00 through 15)
Ladder Symbol
Definer Values
CP
R
CNT N
SV
SV: Set value (BCD)
SP10: #
SP16, SP20: I/O, work, DR, LR, #
Operand Data Areas
Each TC number can be used as the definer in only one timer or counter in-
struction.
TC 11 through TC 15 should not be used in CNT if they are required for the
specific instruction to which they are assigned. Refer to the table on page 82.
Description
Precautions
Limitations
Instruction Set
Section 3-7