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20 BUILT-IN ANALOG FUNCTION
20.1 Function Outline
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20
20 BUILT-IN ANALOG FUNCTION
The analog I/O terminal functions built into the FX5U CPU module are explained below.
20.1 Function Outline
There are two lines of analog voltage input and one line of analog voltage output built into the FX5U CPU module.
Functions must be configured using parameters to use the built-in analog circuits.
The values resulting from A/D conversion by the FX5U CPU module are automatically written in special registers for each
channel.
By setting values into the special registers in the FX5U CPU module, the signal after D/A conversion is automatically output.
For details on the function, refer to the following manual.
MELSEC iQ-F FX5 User's Manual (Analog Control)
20.2 Analog Input/Output Specifications
Analog input/output specification is shown below.
Analog input specifications
*1 "Digit" refers to digital values.
Analog output specifications
*1 There is a dead band near 0 V output, which is an area where some digital input values do not reflect analog output values.
*2 External load resistance is set to 2 k when shipped from the factory. Thus, output voltage will increase somewhat if the resistance is
set higher than 2 k. When the resistance is 1 M, output voltage increases by a maximum 2%.
*3 "Digit" refers to digital values.
Item Specifications
No. of analog input points 2 points (2 channels)
Analog input Voltage 0 to 10 V DC (input resistance 115.7 k)
Digital output Unsigned 12-bit binary
Input characteristics, max. resolution Digital output value 0 to 4000
Max. resolution 2.5 mV
Precision
(Precision for the max. digital output value)
Ambient temperature 25 5 Within 0.5% (20 digit
*1
)
Ambient temperature 0 to 55 Within 1.0% (40 digit
*1
)
Conversion speed 30 s /CH (data refreshed every operation cycle)
Absolute max. input -0.5 V, +15 V
Insulation method Inside the PLC and the analog input circuit are not insulated. Between
input terminals (channels) is not insulated.
No. of occupied input/output points 0 point (does not pertain to the max. No. of input/output points of the PLC.)
Item Specifications
No. of analog output points 1 point (1 channel)
Digital input Unsigned 12-bit binary
Analog output Voltage 0 to 10 V DC (external load resistance 2 k to 1 M)
Output characteristics, max. resolution
*1
Digital input value 0 to 4000
Max. resolution 2.5 mV
Precision
*2
(Precision for the max. analog output value)
Ambient temperature 25 5 Within 0.5% (20 digit
*3
)
Ambient temperature 0 to 55 Within 1.0% (40 digit
*3
)
Conversion speed 30 s (data refreshed every operation cycle)
Insulation method Inside the PLC and the analog output circuit are not insulated.
No. of occupied input/output points 0 point (does not pertain to the max. No. of input/output points of the PLC.)