Functions - Omron CQM1H series Operation Manual

Functions

Terminals
2-1-1 Functions of Setting Pins
2-2 Functions
2-2-1 Output Characteristics
Voltage Output
Terminal
Output terminal 1
Output terminal 2
The setting pins are used to prohibit negative voltage output.
Setting pin
JT1 Word n: Normal setting
JT2 Word n + 1: Normal setting
When negative voltage output is prohibited, 0 V is output from the voltage output
terminal if the Analog Output Unit has negative voltage output data.
Note 1. At the time of program debugging with an external device connected to the
Analog Output Unit, set the setting pins to prohibit negative voltage output
so that the wrong output will not damage the external device. Do not use the
Analog Output Unit to output negative voltage while the setting pins are set
to prohibit negative voltage output.
2. If an input circuit incorporating a pull-up resistor is connected to the Analog
Output Unit, set the setting pins to normal setting. If the setting pins are set to
prohibit negative voltage output, the Analog Output Unit will be influenced
by the synch current and no output will be ON properly.
3. Do not touch any internal components other than the setting pins.
The Analog Output Unit converts data from the CPU into voltage or current and
outputs the data to the voltage terminal or current terminal.
Data between 0000 and 07FF (hexadecimal) for output from the CPU are con-
verted into a voltage of 0 to 10 V and output.
Negative voltage is converted to 2's complement with the MSB. Data between
F800 to FFFF (hexadecimal) for output from the CPU is converted into a voltage
of –10 to 0V and output. If negative voltage output is prohibited, 0 V will be out-
put.
Bits 11 to 14 of output data have nothing to do with output voltage. For example,
0 V is output for 0000 and 7800 (hexadecimal).
MSB
15
These four bits have nothing to do with the output voltage.
Connect analog output for output 1.
Connect analog output for output 2.
Status
Left Right
1 2 3
(factory set)
(factory set)
10 9 8 7 6 5 4
Section 2-2
Usage
Left Right
1 2 3
Word n: Negative voltage
output prohibited
Word n + 1: Negative voltage
output prohibited
LSB
3 2 1 0
MSB: Most significant bit
LSB: Least significant bit
109