6. Function blocks6.1 Manufacturer function blocks6.1.4.3 PO - Pulse outputGeneralThe DC versions of easyE4 base devices provide 2 pulse output func-tion blocks, PO01 through PO02. These function blocks make it pos-sibly to quickly output 24 V pulses in order to drive stepper motors.Pulse output PO01 is hardwired to device output Q1 and PO02 todevice output Q2.If you use a PO function block with its hardwired device outputQ1 or Q2, do not not assign that device output again in the pro-gram. Doing so will not have any effect, as a state change bythe function block has a higher priority.WARNINGUNFORESEEABLE SWITCHING STATES AT OUTPUTWhen using the PO function block, strictly observe the separate assign-ment of the outputs if other hardware-dependent function blocks areused, such as the PW function block.If this is not observed, unforeseeable switching states may occur at the output con-cerned.284 easyE4 11/18 MN050009 EN www.eaton.com
