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Matrix keyboard 4X4

Created by: automatizzando at: 9/30/2018 7:58 PM (6 Replies)

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9/30/2018 7:58 PM	Rate (0)
automatizzando Bronze Member Joined: 3/11/2007 Last visit: 1/16/2025 Posts: 226 Rating: (13)	Good evening, I need to connect a 4X4 matrix keyboard to the PLC inputs. Unfortunately I could not find a keyboard in modbus rtu or tcp, so I decided to sacrifice the inputs on board the PLC But I have a doubt about the links. Do they need pull up or pull down resistors ?. How to connect the keyboard to the inputs ?. Thank you

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9/30/2018 10:08 PM	Rate (0)
#dP Posts: 2826 Rating: (688)	Hello. automatizzando Good evening, I need to connect a 4X4 matrix keyboard to the PLC inputs. Unfortunately I could not find a keyboard in modbus rtu or tcp, so I decided to sacrifice the inputs on board the PLC But I have a doubt about the links. Do they need pull up or pull down resistors ?. How to connect the keyboard to the inputs ?. Thank you Did you construct the keyboard yourself or is it some standard item? Hard to help on the subject without some specifications. ~
#dP Posts: 2826 Rating: (688)
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9/30/2018 10:39 PM	Rate (0)
automatizzando Bronze Member Joined: 3/11/2007 Last visit: 1/16/2025 Posts: 226 Rating: (13)	Hi, the keyboard is of the standard type, like this scheme. Pee being exact is 4X3 Attachment Tastiera.jpg (272 Downloads)
	Last edited by: automatizzando at: 9/30/2018 10:39:46 PM
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10/4/2018 10:52 PM	Rate (0)
automatizzando Bronze Member Joined: 3/11/2007 Last visit: 1/16/2025 Posts: 226 Rating: (13)	Does anyone have any idea how to connect the taster to the PLC? Thank you

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10/5/2018 7:56 AM	Rate (1)
Yu-wen Tang Silver Member Joined: 10/7/2009 Last visit: 1/20/2025 Posts: 266 Rating: (95)	Dear automatizzando, Wiring example: Connect the C1~C4 to PLC's Q0.0~Q0.3 and R1~R4 to I0.0~I0.3. Develop your codes referencing to this document: 3.Scanning to Detect Key Presses. Best regards, Yu-wen

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10/5/2018 9:23 AM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/21/2025 Posts: 34532 Rating: (4307)	Hello automatizzando, in attachment a possible solution (TIA V13). Attachment Keyboard 4x4.zip (335 Downloads)
	Last edited by: ixo65 at: 10/5/2018 6:11:40 PM Last edited by: The Helping Hand at: 10/8/2018 9:41:39 AM Deleted link, added attachment.
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This contribution was helpful to 1 thankful Users Yu-wen Tang

11/1/2018 12:51 PM	Rate (0)
automatizzando Bronze Member Joined: 3/11/2007 Last visit: 1/16/2025 Posts: 226 Rating: (13)	ixo65 Hello automatizzando, in attachment a possible solution (TIA V13). Grazie per l'aiuto

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