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Ratio Conversion Function Section 7-8
Specifying Ratio
Conversion Function
To specify the use of Loop 1 and Loop 2 and their I/O relationships, set bits 08
to 11 of DM Area word D (m) as shown in the following diagram.
The response time of ratio conversion (input-to-output conversion) is 850
µs
for a resolution of 4,000 and 420
µs for a resolution of 8,000.
For the DM word addresses, m = D20000 + (unit number x 100).
Specifying Ratio Set Value
and Bias
The ratio set value (A) and the bias (B) are set in the DM words from D(m+10)
to D (m+13).
For the DM word addresses, m = D20000 + (unit number x 100).
Note 1. After making the DM settings from a Programming Device, it will be neces-
sary to either turn the power to the PLC OFF and ON, or turn ON the Spe-
cial I/O Unit Restart Bit to transfer the contents of the DM settings to the
Special I/O Unit. For details regarding the Special I/O Unit Restart Bit, refer
to 7-10-4 Restarting Special I/O Units.
2. The calculation results will be output in digital values to word n+5 (Loop 1)
and word n+6 (Loop 2).
3. If an input cable is disconnected, the calculation value will become 0000,
and the analog output value will be output according to the output hold
function.
4. If the output value exceeds the specified signal range due to the ratio con-
version of the digital input value, the calculation result and analog output
will be given as the lower or upper-limit value.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
D (m)
Loop 2 Loop 1
00: Not used.
01: Uses positive gradient conversion.
10: Uses negative gradient conversion.
11: Same as 10 above.
DM word Function Set value
D (m+10) Loop 1 (input 1 → output 1),
A constant
BCD 0 to 9999 (0.00 to 99.99;
unit: 0.01)
D (m+11) Loop 1 (input 1 → output 1),
B constant
16-bit binary data
D (m+12) Loop 2 (input 2 → output 2),
A constant
BCD 0 to 9999 (0.00 to 99.99;
unit: 0.01)
D (m+13) Loop 2 (input 2 → output 2),
B constant
16-bit binary data
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