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Analog Output Units Section 5-2
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.
Output Status after
Communications Error
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.
Converted Data Output the converted data to the Master as shown in the following diagram.
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.
Conversion Time The conversion data is refreshed every 4 ms for all 4 points.
Current
20.8
mA
20 mA
4 mA
3.2 mA
0 mA
FED4
(
−
300)
1770
(6000)
189C
(6300)
8000
0000 (0)
7FFF
Converted data
Hexadecimal
(Decimal)
Output signal range Clear to minimum Clear to maximum Clear to 0 V
0 to 5 V –0.25 V 5.25 V –0.25 V
1 to 5 V 0.8 V 5.2 V 0.8 V
0 to 10 V –0.5 V 10.5 V –0.5 V
–10 to 10 V –11 V 11 V 0 V
4 to 20 mA 3.2 mA 20.8 mA 3.2 mA
Bit
First word
First word + 1
First word + 2
First word + 3
Output 0 data
Output 1 data
Output 2 data
Output 3 data
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