6ES7 222-1HF22-0XA8 EM222 8 relay
6ES7 222-1BF22-0XA8 EM222 8 out 24VDC, switch volume
6ES7214-2AD23-0XB8 CPU224XP DC / DC / DC, 14DI / 10DO, 2AI / 1AO
6ES7214-2BD23-0XB8 CPU224XP relay output, 14DI / 10DO, 2AI / 1AO
6ES7 223-1BM22-0XA8 EM223 32 in / 32 out 24VDC, switch volume
6ES7 223-1PM22-0XA8 EM223 32 into 24VDC / 32 relay
Relay output is a module channel to increase the relay to isolate the field device and the module circuit to play a security role, the switch is the ordinary opening and closing point output.
The relay is the output of the coil with the power of the contacts closed. The other output is the transistor's electronic switch output. If you want to open a very frequent off, it is recommended to use the transistor out
Both are isolated, but the relay work load current can be larger, but the operating frequency can not be too high, while the switch output current is small, but the operating frequency can be high, the specific work to be determined by the load, the actual use In the proposed use of the switch, the need to use high-power load coupled with the relay, which can improve the reliability of the equipment
Relay output type: the port is a relay contact, the output control circuit from the voltage and polarity restrictions, can be 24VDC, it can be 220VAC. Output drive current is relatively large. The disadvantage is that the output on-off conversion is slow, short life
Switch output type: the port is a transistor inside, the output control circuit requirements are 24VDC below the DC voltage, and to distinguish between the polarity, the output current is generally below 0.5A, but the output on-off conversion speed, life than the relay output longer The
