4
2.2 Performance indicators
Table 2-2 Performance indicators
-10Vdc to +10Vdc, input impedance
1MΩ
4 channels can be used simultaneously.
-20mA to +20mA, input impedance 250Ω
Current setting range: -2000 to +2000
Voltage setting range: -10000 to +10000
The analogue circuitry is isolated from the digital circuitry by an opto-coupler. The analogue
circuitry is internally isolated from the module input 24Vdc supply. No isolation between
analogue channels
2.3 Indicator light description
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
3 Characteristic settings
The input channel characteristics of the VC-4AD are the linear relationship between the channel analogue input quantity A
and the channel digital output quantity D, which can be set by the user. Each channel can be understood as the model shown in
Figure 3-1, and since it is a linear characteristic, the characteristics of the channel can be determined by determining two points P0
(A0, D0) and P1 (A1, D1), where D0 indicates that when the analogue input isA0 D0 indicates the channel output digital quantity
when the analogue input isA0 and D1 indicates the channel output digital quantity when the analogue input is A1.
D1
A
Channel Characteristics
D0
A0 A1
P 1
P0
D
Channel D
Digital Output
A
Analog input Channel model
Figure 3-1 Schematic diagram of the channel characteristics of the VC-4AD
In consideration of the user's ease of use and without affecting the realization of the function, in the current mode, A0 and
A1 correspond to [Actual Value 1] and [Actual Value 2] respectively, and D0 and D1 correspond to [Standard Value 1] and
[Standard Value 2] respectively, as shown in Figure 3-1, the user can change the channel characteristics by adjusting (A0,D0) and
(A1,D1), the factory default (A0,D0) is the external The factory default (A0,D0) is the 0 value of the external analogue input,
(A1,D1) is the maximum value of the external analogue input. This is shown in Figure 3-2.
