Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
The same function can also be implemented with IL (AWL) instructions. This variant works independently of the cycle time of the user program.Example:COBSTL OUT OUT0 0 WD_Flag WD_Flag O255 : : : :;or1…15;Inverthelpflag;Setoutput255toflashingECOBWith the code shown in the example, the watchdog also drops out in the case of loops caused by the programmer. With regard to the cycle time of the user program, please note:  With cycle times over 200 ms, the code sequence must be repeated several times in the user program, to prevent the watchdog dropping out in normal operation.Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 09│2012-01-253-47PCD2.M5_ Classic CPUs and expansion housingsSoftware watchdogAs address 255 is in the normal I/O range, there are restrictions on the permissibleI/O modules in certain sockets:CPU typeRestrictionsPCD2.M5_