Functions - Omron SYSMAC C Series Operation Manual

Functions, Settings and Wiring

4-2-2 Functions

A/D Conversion
Voltage Inputs
0FFF
(4095)
Digital
value
0000
0
Offset (see note 1)
C500-AD101 Functions
32
The relationships between the input analog values and the converted binary val-
ues are shown below. Binary values are given with their hexadecimal equiva-
lents.
Gain (see note 2)
(2)
(1)
5 V
1 V
10 V
Analog input voltage
Analog input voltage and current values are converted to binary between the off-
set and gain values set for the input.
Line (1) in the above figures shows the factory settings of 1 to 5 V (4 to 20 mA).
This means that an input of 1 V (4 mA) will be converted to 000
5 V (20 mA) will be converted to FFF
The maximum ranges, 0 to 10 V (0 to 20 mA) are shown by line (2) in the figures.
Note 1. For voltage input, if the offset or gain is set outside the range of 0 to 10 V, the
output is locked at 000
For current input, the output corresponding to a negative current input is
locked at 000
is not locked.
2. The offset is the analog input value corresponding to an output of 000
3. The gain is the analog input value corresponding to an output of FFF
The C500-AD101 offers the following four functions in addition to A/D conver-
sion.
Mean Value
The mean input data value over the specified sampling count is output. Specify
the sampling count between 2 and 9,999. The maximum conversion time is
10 ms per input.
Peak Hold
The peak value of the input signals is held and output when requested by the
CPU Unit. The peak value can be reset by an instruction from the CPU Unit.
Disconnection Detection
Detects if an input lead is disconnected, and turns the Disconnection Detect Flag
ON. The disconnection detection level is half or less of the lower limit specified
by the user. If, for example, 4 mA is specified as the lower limit, disconnection will
be detected when the current value drops below 2 mA. This function is not avail-
able if the gain is lower than 1 V (4 mA).
Current Inputs
0FFF
(4095)
(2)
Digital
value
0000
4 mA
0
Offset (see note 1)
* Current input 20 mA max.
.
Hex
or FFF , respectively.
Hex Hex
but the output corresponding to an input exceeding 20 mA
Hex
Section 4-2
Gain (see note 2)
(1)
20 mA
Analog input voltage
and an input of
Hex
.
Hex
.
Hex