Hello everyone, I am currently in the process of connecting a PLC S7-1200 DC/DC/DC to a motor and an HMI. I have some queries regarding the wiring: 1. What is the purpose of connecting Pin (L+, 3) from the PLC to the Relay, and why is this link crucial for the setup? 2. When it comes to the PLC Power Supply, should I directly link L1 to +24V and N to 0V for pins of the PLC? Are there any specific safety measures that I should keep in mind during this process? Thank you in advance for your guidance!
1. The image appears slightly unclear, but it seems to show a contact meant for indicating an overload trip in electrical equipment. 2. The L1 and N terminals are used for connecting the device to a 120 volt AC power source.
In a forum thread, a user named DarrylR pointed out that the picture provided is a bit blurry but appears to show a contact used for signaling an overload trip. The L1 and N terminals are for 120 volt AC connections and serve as the neutral connections for device power. Another user agreed, noting that the 24V and Input connections are used to detect an overload in the PLC system. It is emphasized that the L1 and N terminals are for AC, not DC, clearly marked as 120-220VAC. This clarification is important as the original poster (OP) of the question seemed to be confused about where the 24VDC connections should be made.
Please take note that the pictured relay model is an AC/DC/RLY, not a DC/DC/DC as mentioned. This may require different relays. Therefore, your relay would require 24V and 0V to the corresponding pins for proper function and compatibility.
According to robertmee, the power requirements for L1 and N are 120-220VAC, not DC, as indicated on the terminals. It appears that the 1200 series offers models that can be powered by either 120/240AC or 24DC. One user mentioned one option, while another user mentioned the other option. Let's hope this difference was intentional.
MK42 noted that 1200 series devices offer variations operating on either 120/240V AC or 24V DC power sources. The photo displays one option while the original poster mentioned the other; hopefully, this difference was deliberate. Which do we trust more - the image or the OP's words?
Hey there! Pin (L+,3) connects to a Relay because the PLC can't handle the same electrical load that the motor requires, so a relay is a safe way to manage this disparity. This ensures that the PLC is not overwhelmed, thus maintaining the efficiency of your setup. Regarding the PLC power supply, your wiring seems correct. Always remember to disconnect the mains supply before wiring or making any changes, treat PLC circuits as live at all times, and wear appropriate protective gear. Proper maintenance is a powerhouse of prevention!
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Answer: - Answer: Connecting Pin (L+, 3) from the PLC to the Relay is crucial for signaling the motor to start or stop based on the PLC program logic. It serves as a key connection point to control the motor's operation.
Answer: - Answer: It is recommended to directly link L1 to +24V and N to 0V for the pins of the PLC Power Supply. This ensures proper power distribution and functioning of the PLC. Additionally, it is important to follow specific safety measures such as ensuring proper insulation, avoiding short circuits, and adhering to electrical codes to prevent any accidents.
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