Parker IQAN-MC31 Instruction Book

27Low-side digital outputsInstruction book, IQANLow-side digital outputsThe low-side digital outputs may control relays and on/off valves.For the maximum load per output see Appendix A.Connecting loads to low-side digital outputsConnecting of loads to the low-side digital outputs such as on/off valves is done byusing the DOUT(LS) positions and one or more DOUT channels as supply.Protection against voltage transientsA clamping diode must be placed between the source and low-side digital output, asclose to the load as possible. This protects the output against high voltage transients.For example, use diode: 1N5408 (3A/1000V).Depending on the load, other clamping diodes might be used instead.W ARNINGLoads on DOUT with Low-Side switch (DOUT[LS]) must always be controlled on thehigh-side by connection to a digital output with High-Side switch (DOUT-X) for safefunction. The total sum of current supplied to the loads controlled by a number ofDOUT[LS] is limited to 2000mA.Remember that these flexible I/O pins must be configured in pairs of the same type,VIN, DIN or DOUT-LS.EXAMPLEConnect the on/off valves to the low-side digital outputs using a pair of theDOUT(LS) positions, and the DOUT-X, as supply.A clamping diode must be placed as close to the load as possible, see figure below.Connecting loads to the low-side digital outputs.d2DOUT-XDOUT(LS)DOUT(LS)d1IQAN module