All models of the H41q system family have all the components required for control tasks in a 19 inch subrack 5 units high with an integrated cable tray. â?? Depending on the system model, one or two central modules controlled by micro processors â?? Two interfaces RS485 on the central module for a transfer rate of up to 57600 bps â?? The central module generates a watchdog signal to switch off the testable output modules as the second way of switch off in the case of a fault â?? One or two power supply modules 24 V DC/5 V DC to generate the 5 V DC operating voltage for the central modules and the control voltage for the input/output modules