PLC

Case Study
Replacement of OMRON C-type PLC

This is an example of PLC replacement for equipment used in a food factory in Saitama Prefecture. We replaced OMRON C-type PLC C28P with CP series PLC CP1E. Obtained a paper-based copy of the C28P ladder before it was replaced. The OMRON C28P PLC before the replacement was not equipped with a cable for ladder […]

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Mitsubishi PLC GX Configurator-SC RS-232C unsynchronous data transfer with protocol communication.

When performing protocol communication with a partner device such as a barcode reader using the unsynchronous data transfer of the serial communication unit of a Mitsubishi Q series PLC, it was necessary to create a ladder program for all communication processing.Using the communication protocol support function of GX Configurator-SC, you can register the protocol for […]

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Test
PLC Remote Maintenance Test [1] Monitor and change the program of a PLC at a remote location.

When it becomes necessary to monitor the PLC programs of facilities and equipment installed in remote locations, or to investigate the programs, it is usually necessary to visit the site to take action, but due to the current impact of the new coronavirus infection, it may become difficult to visit in the future.Remote work is […]

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Case Study
The "MODE" and "RUN" lamps of the Mitsubishi PLC Q series CPUs turn off and do not operate

Have you ever been in a hurry because the "MODE" and "RUN" lamps of the CPU unit did not light up when you turned on the power of the PLC? Why the "MODE" lamp of the CPU unit does not light up on a Q-series PLC According to the Q CPU User's Manual (Hardware Design, […]

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Case Study
Fuji Electric PLC MICREX-F Series Ladder data backup

We received a request from a company operating plating-related equipment in Tokyo to back up the ladder data of an old Fuji Electric PLC.The PLC model is Fuji Electric MICREX-F series FPU 080A-A10, which is aging due to the plating environment, and they are considering replacing it with MICREX-SX series in the future. Prepare programming […]

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Column
Pay attention when using the Keyence PLC timer instruction [TMR]

The timer instruction in a sequence program adds up the time while the input condition is ON, and when the set value is reached, the specified device turns ON. When you design a sequence program for a device, you are sure to use the timer instruction.In this article, I will show an example of an […]

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Case Study
Simple CPU communication by Ethernet connection between Mitsubishi Q PLC and FX PLC

The data communication method between Mitsubishi's Q series PLC and FX series PLC is simple CPU communication by Ethernet connection. What is simple CPU communication? It is a function that allows Ethernet-connected PLCs to communicate with each other and send/receive device data without programming, with just a simple setting using GX Works2 or 3. Example […]

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Case Study
Control RS232C devices from PLC via Ethernet communication

To control RS232C-equipped devices with a PLC, a serial communication unit is required, and there are some limitations such as one-to-one communication to the port, and the communication distance is usually less than 15m. The RS232C-Ethernet converter enables 1-to-n communication with multiple RS232C-equipped devices at a distance of 100m from the PLC's built-in Ethernet port […]

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