Omron DEVICENET#05-2003 Operation Manual page 139

Analog Output Units
Output Status after
Communications Error
Converted Data
Conversion Time
4 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog
current range of 4 to 20 mA. The entire output range is 3.2 to 20.8 mA.
Current
20.8
mA
20 mA
4 mA
3.2 mA
0 mA
FED4
0000 (0)
8000
( 300)
The Configurator or pins 8 and 9 of the DIP switch can be used to determine
the status of the outputs after a communications error occurs in DeviceNet or
I/O Unit interface communications. The following settings are possible:
• Hold (maintain previous output status)
• Clear to minimum (clear to the lower limit of the output signal range)
• Clear to maximum (clear to the upper limit of the output signal range)
• Clear to 0 V (for –10 to 10 V only)
When the clear to minimum, clear to maximum, or clear to 0 V setting is used,
the output data will be as shown in the following table.
Output signal range
0 to 5 V
1 to 5 V
0 to 10 V
–10 to 10 V
4 to 20 mA
Output the converted data to the Master as shown in the following diagram.
First word
First word + 1
First word + 2
First word + 3
When a negative voltage is to be output, specify the conversion data as the
two's complement. To obtain a two's complement from an absolute value, the
NEG instruction is useful.
The conversion data is refreshed every 4 ms for all 4 points.
1770
(6000)
Clear to minimum Clear to maximum
–0.25 V 5.25 V
0.8 V 5.2 V
–0.5 V 10.5 V
–11 V 11 V
3.2 mA 20.8 mA
Output 0 data
Output 1 data
Output 2 data
Output 3 data
Section 5-2
Converted data
Hexadecimal
189C
7FFF
(Decimal)
(6300)
Clear to 0 V
–0.25 V
0.8 V
–0.5 V
0 V
3.2 mA
Bit
129