Level on interface

Signal type RS422 (diff. input)

The EJ5101-00xx modules expect the levels according to RS422 in differential mode. The data are transferred without ground reference as voltage difference between two cables (signal A and inverted signal /A). The EtherCAT plug-in module evaluates differences greater than 200 mV as valid signals.

The differential signal must be in the common mode range (< +13.2 V and > -10 V, with respect to GND) (cf. diagram). Signal levels outside this range can lead to destruction.

In differential mode, only the voltage difference is evaluated. Thus common-mode interference on the transmission link does not lead to any falsification of the wanted signal, as these interferences act simultaneously on both lines.

Signal type TTL (single-ended)

If the module is only operated in single-ended mode, a nominal level voltage of 3.5 V to 5.5 V is expected.

Wire break detection

Open circuit detection (index 0x8010:0B, 0x8010:0C, 0x8010:0D) is activated for:

• EJ5101 and EJ5101-0090 for typ. -1.5 V > Vid > +1.5 V (subject to change).