Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
Weight 60 g2 g 2 g 2 gHardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 09│2012-01-253-46Saia-Burgess Controls Ltd.PCD2.M5_ Classic CPUs and expansion housingsHardware clock/harware watchdog3.14 Hardware clock (Real Time Clock)The PCD2.M5_ CPUs are fitted with a hardware clock on the motherboard:The presence of a hardware clock is an absolute requirement where the HeaVAClibrary clock timers are used.3.15 Hardware watchdog3PCD2.M5_ CPUs are fitted with a hardware watchdog as standard. A relay at I/O address 255 can be triggered; this remains activated as long as the status of O 255 changes periodically at least every 200 ms. Within PG5, FBoxes are provided for this purpose.If for any reason the program component with the watchdog FBox is no longer being processed at sufficiently short intervals, the watchdog relay will drop out and the amber watchdog LED will go out. Please read the online help for these FBoxes for more details.