7 Modbus RTU7.3 Control terminal functions with Modbus RTU116 DE1 variable speed starter 09/14 MN040011EN www.eaton.com7.3 Control terminal functions with Modbus RTUfigure 76: Digital control when P-12 = 3 (example)The control terminals' function can be configured for the Modbus RTUoperating mode (P-12 = 3) by using parameter 15:Table 36: Configuration for control terminals DI1 to DI4 when using Modbus RTU￫ If Modbus RTU is being used, there must always be an enablesignal (ENA) present at control terminal DI1 (or DI2 = ENADIR)before the enable signal sent via Modbus RTU will be accepted,￫ Figure 75, page 113.P-15(Mode)DI1 DI2 DI3 DI40 ENA ENADIR FF1 n. F.1 ENA ENADIR EXTFLT n. F.2 ENA ENADIR FF20 FF2 13 ENA FF1 EXTFLT n.F.4 1) ENA UP FF1 DOWN5 1) ENA UP EXTFLT DOWN6 1) ENA ENADIR UP DOWN7 ENA FF2 0 EXTFLT FF2 18 ENA DIR FF1 n.F.9 ENA DIR EXTFLT n.F.1) P-15 = 4, 5, and 6 requires an enable signal (start command) via Modbusand at DI1. Digital reference values sent via Modbus will be ignored in thiscase.It will only be possible to use UP and DOWN to set a reference value.n.F. = No function.When configured this way, the control terminals with "n.F." will have nofunction whatsoever!DI3DI4DI2DI10 V 4321+10 V
