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FIGURE 2.78
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Wire terminal.
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FIGURE 2.79 Pin connector.
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integrated with various production operations. The following factors will affect the performance of the switch logic circuit: Excessive leakage current in parallel-connected loadpowered devices Excessive voltage drop in series-connected devices Inductive feedback with line-powered sensors with parallel connections
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Parallel-Connection Logic-OR Function
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The binary OR logic in Table 1.9 indicates that the circuit output is ON (1) if one or more of the sensors in parallel connection is ON. 0 = OFF 1 = ON
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TABLE 2.9 Binary Logic Chart Parallel Connection
FIGURE 2.80
Parallel sensor arrangement.
It is important to note that, in two-wire devices, the OFF state residual current is additive (Fig. 2.80). If the circuit is affected by the total leakage applied, a shunt (loading) resistor may have to be applied. This is a problem in switching to a programmable controller or other high-impedance device.
Example.
Ia + Ib + Ic = It 1.7 + 1.7 + 1.7 = 5.1 mA Three-wire 10 to 30 V can also be connected in parallel for a logic OR circuit configuration. Figure 2.81 shows a current sourcing (PNP) parallel connection. Figure 2.82 displays a current sinking (NPN) parallel connection. It may be necessary to utilize blocking diodes to prevent inductive
FIGURE 2.81 Sourcing (PNP) parallel sensor arrangement.
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FIGURE 2.82 Sinking (NPN) parallel sensor arrangement.
FIGURE 2.83
Blocking diodes.
feedback (or reverse polarity) when one of the sensors in parallel is damped while the other is undamped. Figure 2.83 demonstrates the use of blocking diodes in this type of parallel connection.
Series-Connection Logic AND Function
Figure 2.84 shows AND function logic indicating that the series-connected devices must be ON (1) in order for the series-connected circuit to be ON.
FIGURE 2.84 Series AND logic.
Two
FIGURE 2.85
Series connected, load powered.
The voltage drop across each device in series will reduce the available voltage the load will receive. Sensors, as a general rule, have a 7-to-9-V drop per device. The minimum operating voltage of the circuit and the sum of the voltage drop per sensor will determine the number of devices in a series-connected circuit. Figure 2.85 shows a typical two-wire AC series-connected circuit. Series connection is generally applied to two-wire devices, most commonly two-wire AC. A 10 to 30-V DC two-wire connection is not usually practical for series connection because of the voltage drop per device and minimum operating voltage. Three-wire devices are generally not used for series connection. However, the following characteristics should be considered for three-wire series-connected circuits (Fig. 2.86): Each sensor must carry the load current and the burden current for all the downstream sensors (Fig. 2.86). When conducting, each sensor will have a voltage drop in series with the load, reducing the available voltage to the load. As with two-wire devices, this and the minimum operating voltage will limit the number of devices wired in series.
FIGURE 2.86 Series connected, line powered.
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When upstream sensors are not conducting, the downstream sensors are disconnected from their power source and are incapable of responding to a target until the upstream sensors are activated (damped). Time before availability will be increased due to the response in series. Series and parallel connections that perform logic functions with connection to a PLC are not common practice. Utilizing sensors this way involves the preceding considerations. It is usually easier to connect directly to the PLC inputs and perform the desired logic function through the PLC program.
Inductive and Capacitive Sensor Response Time Speed of Operation
When a sensor receives initial power on system power-up, the sensor cannot operate. The sensor operates only after a delay called time delay before availability (Fig. 2.87). In AC sensors, this delay is typically 35 ms. It can be as high as 100 ms in AC circuits with very low residual current and high noise immunity. In DC sensors, the time delay is typically 30 ms.
Response and Release Time
A target entering the sensing field of either an inductive or a capacitive sensor will cause the detector circuit to change state and initiate an output. This process takes a certain amount of time, called response time (Fig. 2.88). Response time for an AC sensor is typically less than 10 ms. DC devices respond in microseconds. Similarly, when a target leaves
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