User Manual

3
For user terminal wiring requirements, please refer to Figure 1-5. when wiring, please pay attention to the following 7 aspects.
1. It is recommended that twisted shielded cables be used for the analogue outputs and that the cables be routed away from power cables
or other wires that may cause electrical interference.
2. Use a single point of earth at the load end of the output cable.
3. If there is electrical noise or voltage fluctuations in the output, connect a smoothing capacitor (0.1μF to 0.47μF/25V).
4. The VC-4DA may be damaged if the voltage output is short-circuited or if a current load is connected to the voltage output.
5. Ground the module's ground terminal PG well.
6. The analogue power supply can use the auxiliary output 24 Vdc power supply of the main module, or any other power supply that
meets the requirements.
7. Do not use the empty pin on the user terminal
2 Instructions for use
2.1 Power indicator
Project
Instruction
Analog Circuits
24Vdc (-10% to +10%), maximum allowable ripple voltage 5%, 50mA (from main module or external power supply)
Digital Circuits
5Vdc 72mA (from main module)
Table 2-1 Power supply indicators
2.2 Performance indicator
Project
Instruction
I/O points occupied
No
Conversion speed
2ms per channel (changing the number of channels used does not change the conversion speed)
Analogue
output
Voltage output
-10 to 10Vdc (external load impedance not less than 2kΩ)
Current output
0 to 20mA (external load impedance of 500Ω or less)
Project
Instruction
Analogue output mode
Corresponding digital quantities
Passage closure
Output range -10V to 10V
–10000～10000
Output range 0mA to 20mA
0～2000
Output range 4mA to 20mA
0～2000
Project
Instruction
Digital inputs
Default setting: -10000 to 10000, Allowed range: -10000 to 10000
Resolution
Voltage output
1mV（10V/10000）
Current output
2μA（20mA/10000）
Overall accuracy
±1% (for full range of 10V)
±1% (for full range of 20mA)
Isolation
The analogue and digital circuits are isolated by opto-couplers. The analogue circuit power supply and
the external power supply are isolated with DC/DC. No isolation between analogue channels
2.3 Indicator light description
Project
Instruction
Signal indicator
RUN status indicator, blinking when normal
ERR error status indicator, illuminated on failure
Expansion module rear stage interface
Connection of rear modules, hot-swappable not supported
Expansion module front interface
Connection of front-end modules, hot-swappable not supported