C R O S S A U T O M A T I O N . . . . A P P L I C A T I O N N O T E S
Project: RS-232 to RS-422 Host Link Communications to Omron PLCs
Listed below are three different converters that can be used on the PC side of the communications. All have been tested and work with the Omron PLC hardware listed below.
NT-AL001 (Omron) – Is DIN-Rail mounted. Connector for the RS-232 side is a standard DB9 connector with custom pin out and RS-422 side is a removable terminal block. The only disadvantage is the need for a 5 VDC power supply that is connected through the DB9 connector of the converter. ($175.00)
ADAM-4520 (Advantech) – Can be DIN-Rail or panel mounted. Connector for the RS-232 side is a standard DB9 used with a standard serial male to female cable and the RS-422 side is removable screw terminals. Power is 10-30 VDC connected on RS-422 connector. The only disadvantage is the need to remove the entire case to set configuration dipswitches. ($130.00)
422PP9TB (B&B Electronics) – Converter can be mounted directly to the PC serial port with a screw terminal connector for the RS-422 side. Power is 12 VDC connected on RS-422 terminal block. The only disadvantage is the fact that B&B Electronics is a third tier vendor. ($74.95)
The following tables list the different types of PLC CPUs and communication ports used for the test, and the different converters used to convert from RS-422 back to RS-232. The converters are listed in order from best option to last resort. For those situations where it is necessary to use a cable along with the converter, I have included a cable recommendation or a wiring diagram.
MICRO PLC SERIES
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RS-232 Port |
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Peripheral Port |
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CJ1W-CIF11 |
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CPM1-CIF11 |
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CPM2A |
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NS-AL002 |
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CPM1-CIF01 & NT-AL001* |
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NT-AL001* |
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CPM1-CIF01 & ADAM-4522* |
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ADAM-4520* |
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* Refer to wiring diagram for connecting cable |
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Peripheral Port (Dip Sw. 4 ON) |
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CJ1W-CIF11 & CPM2C-CN111 |
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CPM2C |
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NS-AL002 & CPM2C-CN111 |
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CPM2C-CIF11(RS-422 Port) |
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CPM1-CIF11 & CS1W-CN114 |
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MIDSIZED PLC SERIES
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RS-232 Port |
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Peripheral Port |
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CQM1 |
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NT-AL001* |
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CPM1-CIF11 |
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ADAM-4520* |
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CPM1-CIF01 & NT-AL001* |
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CPM1-CIF01 & ADAM-4522* |
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* Refer to wiring diagram for connecting cable |
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RS-232 Port |
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Peripheral Port (Dip Sw. 4 ON) |
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SCB41 RS-232 Port |
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CJ1W-CIF11 |
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CJ1W-CIF11 & CPM2C-CN111 |
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NT-AL001* |
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CQM1H |
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NS-AL002 |
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NS-AL002 & CPM2C-CN111 |
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ADAM4520* |
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NT-AL001* |
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CPM2C-CIF11(RS-422 Port) |
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ADAM-4520* |
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CPM1-CIF11 & CS1W-CN114 |
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* Refer to wiring diagram for connecting cable |
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HIGH END PLC SERIES
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RS-232 Port |
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Peripheral Port |
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C200HW-COM** |
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C200HE |
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CJ1W-CIF11 w/ standard serial cable |
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CPM1-CIF11 |
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CJ1W-CIF11 |
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C200HG |
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NS-AL002 w/ standard serial cable |
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CPM1-CIF01 & NT-AL001* |
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NS-AL002 |
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C200HX |
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NT-AL001* |
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CPM1-CIF01 & ADAM-4522* |
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NT-AL001* |
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ADAM4520* |
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ADAM4520* |
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* Refer to wiring diagram for connecting cable |
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** Extension cable necessary to access connector |
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RS-232 PORT |
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Peripheral Port (Dip Sw. 4 ON) |
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SCU21 & SCU41 |
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CJ1G |
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CJ1H |
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CJ1W-CIF11 |
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CJ1W-CIF11 & CPM2C-CN111 |
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CJ1W-CIF11 |
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CJ1M |
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NS-AL002 |
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NS-AL002 & CPM2C-CN111 |
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NS-AL002 |
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CS1G |
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NT-AL001* |
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CPM2C-CIF11(RS-422 Port) |
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NT-AL001* |
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CS1H |
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ADAM-4520* |
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CPM1-CIF11 & CS1W-CN114 |
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ADAM4520* |
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* Refer to wiring diagram for connecting cable |
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