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PET-70216/ET-7026 User Manual, version 1.0.1 beta1, Page: 110

Appendix C. Modbus Application Notes

C.1. Dual Watchdog

Dual Watchdog consists of Module Watchdog and Host Watchdog.

1. The Module Watchdog is a built-in hardware circuit that will reset the CPU module

if a failure occurs in either the hardware or the software. If the application does not

refresh the watchdog timer within 0.8 seconds, the watchdog circuit will initiate a

reset of the CPU.

2. The Host Watchdog is a

software function that can

be used to monitor the

operating status of the

host. Its purpose is to

prevent network

communication problems

or a host failure. If the

Watchdog timeout interval

expires, the module will

return all outputs to a

predefined Safe value

(Refer to the Safe Value

application note), which

can prevent the controlled

target from unexpected

situation.

AO address 40557 of the ET-7000/PET-7000 series Modbus register is the address of

the Host Watchdog timer, and will be stored into EEPROM. The WDT function will be

disabled if the value is set to less than 5 seconds.

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Savin P7026 Bedienungsanleitung Seite 110