How to add a RS232 to RS485 converter to a ACE PLC?

 

It is sometimes useful to be able to connect the ACE PLC to an RS485 network.

As examples:

• connect hundreds ACE PLC on the same RS485 network
• connect a HMI to a ACE PLC far away from the each other where the RS232 is not enough (10 meters about)
• connect an ACE PLC to an external sensor or device: Small display, variable-frequency drive, smart sensor,..

The ACE 1430 and 1450 already have a built-in RS232/485 port, but for the others a small RS232 to RS485 signal converter must be added. It’s not the ideal solution, but it can be useful as our industrial ACE are very powerful and cheap.

• This converter is cheap and reliable. You will find it here:
  • https://aceautomation.eu/product/rs232-to-rs485-converter/
• We also supply the RS232 cable ready to be wired between the RS485 converter and the RS232 socket of the ACE (without ACE connector):
  • https://aceautomation.eu/product/cbl-conv-rs232-cable-ready-to-be-wired-for-rs485-converter/

It has on one side a terminal board for the RS485. Only 485+ A+ and 485- B+ need to be connected. On the other side, for RS232 the classic SUB-D9. Optional RS232 cable. The RS232/485 converter is powered via the RS485 network. It is not necessary to power it except if you have many converters on RS485. RS-232 Side RS-485 Side ACE PLC connector pin 1 <> Sub-D9 Converter Pin 4 485+ (A+) <> Your device A+ ACE PLC connector pin 2 <> Sub-D9 Converter Pin 3 485- (B-) <> Your device B- ACE PLC connector pin 3 <> Sub-D9 Converter Pin 1 GND only connected on the master device side Optional +5 to +12 VDC (Only if serverals converters on network)

RS232 to RS485 converter connected to the ACE connector that is supplied with the ACE Note: Cable sold without ACE connector Connector Viewed from the wire side

 

Connect a HMI to a ACE PLC via RS232/485 converter

Download HMI project

• The HMI project reads a ui16 value from the ACE PLC at address 4×0
• We use the HMI port COM 1 (RS485 pins 9 & 8)
• For HM-070MW (can be changed)

Download PLC program

• It increments the value every second in the Modbus register
• We use the port COM 1 (RS232)
• For ACE-7096 PLC (can be changed)

 

ACE PLC to the RS-232 cable White = RX Red = TX Green = GND	One twisted pair from the converter to the HMI Red = A+ White = B-	Sub-D9 wiring HMI side Pin 9 = A+ Pin 8 = B+