I am currently configuring a Prosoft Datalogger model PLX51-DLplus-232 to collect data from an SLC 5/05 using the DF1 protocol on the DB9 port. For testing purposes, I am using a Micro 1100 as my spare SLC 5/04 is not allowing me to download a new project due to communication faults. Despite the differences between the MicroLogix and SLC, they are supposed to function similarly in terms of addressing and data retrieval. However, I am encountering issues with establishing DF1 communication between the two modules. I am using a 1761-CBL-PM02/C cable from the Micro to a DB9 breakout board, with specific pin configurations. Can anyone provide insights on what I may be overlooking in this setup? Thank you for any assistance.
It is recommended that the connection work even without using jumpers. If facing issues with connecting a DF1 to a Micrologix, try using only the 3 wires for RX, TX, and signal ground when fabricating a cable. If problems persist despite double-checking the setup, consider swapping RX and TX to ensure the documentation for the third-party device was correctly interpreted. The Micrologix 1400 features a nine-pin serial port that closely resembles the SLC and should be electrically equivalent.
After all these years in the industry, I can't believe I never thought to swap the Tx / Rx before. Thank you for the suggestion.
To optimize settings, consider adjusting the Datalogger's DF1 Node Address to 0 instead of 2. While DF1 Full Duplex point-to-point configurations typically disregard the SRC and DST bytes, some devices may interpret the PLC as Node 1 and the polling client as Node 0. Ensure that the PM02 cable, designed for a DTE serial port, connects Pin 2 to the Receive terminal of the Prosoft device contrary to the diagram. Simplify the connection by focusing on Pins 2, 3, and 5. The MicroLogix 1100 features both an RS-232 and an RS-485 port in its circular connector, lacking a +24V power supply pin found in the MicroLogix 1000, 1200, and 1500 models.
It sounds like you're on the right track with your setup, but just to double-check, make sure that your baud rate and communication settings on both the Prosoft Datalogger and the MicroLogix match exactly. Sometimes, even a small mismatch in settings can cause communication issues. Additionally, verify that the cable connections are secure and that you’re using the correct pins as per the cable's documentation. If possible, try running a simple test program on the MicroLogix to ensure it's actively communicating on the DF1 protocol. Good luck, and I hope you get it sorted!
It sounds like you’re doing a thorough job with your setup! One common oversight when dealing with DF1 communication can be the cable configuration—make sure you're connecting the right pins for TX and RX on the DB9 breakout board, as well as ensuring any necessary handshaking signals are appropriately configured. Also, double-check the baud rate and protocol settings on both the Datalogger and the MicroLogix; mismatches here can often lead to communication issues. Lastly, if you haven’t already, try using a different terminal program to see if you can get any response from the MicroLogix, which may help indicate where the failure is occurring. Good luck!
It sounds like you're on the right track, but when dealing with DF1 communications, be sure to double-check your baud rate settings on both the Prosoft Datalogger and the MicroLogix; mismatched settings can often lead to communication failures. Additionally, verify that there are no unintended settings in the MicroLogix configuration that might interfere, such as being in program mode rather than run mode. If your cable is good, also check the pinouts on your DB9 breakout board to ensure they align correctly with the DF1 configuration. Sometimes even a small oversight can cause headaches in getting these systems to talk! Good luck, and I hope it comes together for you!
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Answer: Answer: There could be various reasons for communication issues, such as incorrect cable connections, mismatched communication settings, or configuration errors in the Prosoft Datalogger or MicroLogix PLC.
Answer: Answer: It is crucial to have the correct pin configurations for the cable connections to ensure proper communication between the devices. Double-checking the pin configurations and ensuring they match the requirements of both the Prosoft Datalogger and the MicroLogix PLC is essential.
Answer: Answer: Yes, both devices need to be configured with matching communication settings, such as baud rate, parity, data bits, and stop bits. Ensuring these settings are consistent and accurate on both the Prosoft Datalogger and the MicroLogix PLC is crucial for establishing successful DF1 communication.
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