HW5 solid state relays

HW5 solid state relays - MFET 248 Automated Manufacturing...

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MFET 248, Homework page 1 of 4 MFET 248 Automated Manufacturing III Homework #5 Spring 2010 Name (Last, First): ____________________________________________________________ 1) Consider the Solid State Relay (SSR) shown in Figure 1. Figure 1 – Solid State Relay (SSR) Application Assume that the photo-eye shown in Figure 1 is used to detect the presence or absence of pallets traveling down a conveyor. Assume the field device (a photo-eye in the above example) has a normally open output. Note: A TTL input (such as the one shown in Figure 1) can be LOW (also called logic 0) or HIGH (also called logic 1). In the low input state, the TTL input is connected to the ground of the 5 volt power supply. In the high state, the TTL input is connected to +5 volts DC. When the photo-eye is NOT covered by a pallet, the TTL input will be: (a) LOW (b) HIGH 2) Consider the Solid State Relay (SSR) shown in Figure 1. Which type of SSR is shown in Figure 1? (a) DC In (b) AC In (c) AC out (d) DC out 24 VDC Field Device Output (e.g., photo-eye) +5v Computer
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