4-6SectionAnalog Output Functions
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4-6 Analog Output Functions
4-6-1 Setting Outputs and Signal Ranges
The Analog Output Units only convert analog outputs specified by output num-
bers 1 and 2. In order to specify the analog outputs to be used, use a Peripheral
Device to turn ON the DM bits shown in the following diagram.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
DM (m)
Output 2
Output 1
0: Do not use
1: Use
The analog output conversion cycle can be shortened by setting any unused
output numbers to 0.
Conversion cycle = (1 ms) x (Number of outputs used) + (1ms) x (Number of
outputs used (see note))
Note Refer to 4-5 Analog Input Functions for input settings.
For the DM word addresses, m = 1000 + 100 x unit number (Units #A to #F = Unit
numbers 10 to 15).
Any of four types of output signal range can be selected for each of the two out-
puts (output numbers 1 and 2). In order to specify the output signal range for
each output, use a Peripheral Device to set the DM bits shown in the following
diagram.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Bit
DM (m + 1)
Output 2
Output 1
00: -10 to +10 V
01: 0 to +10 V
10: 1 to 5 V / 4 to 20 mA
11: Same as 10 above.
Note 1. For the DM word addresses, m = 1000 + 100 x unit number (Units #A to #F =
Unit numbers 10 to 15).
2. The I/O signal range of “1 to 5 V” or “4 to 20 mA” is switched according to the
input terminal connections.
3. After making the DM settings from a Peripheral Device, it will be necessary
to either power up the PC again or turn ON the Special I/O Unit Restart Bit in
order 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 4-9-4 Restarting
Special I/O Units.
Output Numbers
Output Signal Range
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