PDS Series User Manual ( V1.4, Oct. 2009) ----- 142
8.23.
Application Notes
Hot Watchdog Status
The Power On Reset or Module Watchdog Reset will return all output settings to
Power On Values. The Host Watchdog Timeout will return all output values to Safe
Values. Additionally, the status of the Host Watchdog, which can be read using the ~AA0
command, will be recorded as 04, and output commands will be ignored until the status is
cleared to 0 by using command ~AA1.
Dual Watchdog Operation
Dual Watchdog = Module Wa Host Watchdog
The Module Watchdog is a hardware reset circuit that is used to monitor the operating
status of the module. When working in harsh or noisy environments, the module may be
interrupted by external signals. The circuit can let the module reboot automatically and to
work continues without halt.
The Host Watchdog is a software function that is used to monitor the operating status
of the host. Its purpose is to keep PDS’s output in a safe state when there is network
communication problem or host PC halt. If the timeout interval expires, the module will
turn all outputs to the predefined Safe Value and prevent unexpected situation from
occurring.
The PDS series with Dual Watchdog will make the control system more reliable and
stable.
Summary of Contents for PDS-700 Series
Page 56: ...PDS Series User Manual V1 4 Oct 2009 56 PDSM 782 D PPDSM 782 D Pin Assignments...
Page 58: ...PDS Series User Manual V1 4 Oct 2009 58 PDS 700 IP67...
Page 59: ...PDS Series User Manual V1 4 Oct 2009 59...
Page 60: ...PDS Series User Manual V1 4 Oct 2009 60...
Page 61: ...PDS Series User Manual V1 4 Oct 2009 61 DS 712 PPDS 712 MTCP Pin Assignments E1 10 100 Base TX...
Page 62: ...PDS Series User Manual V1 4 Oct 2009 62 DS 715 PPDS 715 MTCP Pin Assignments E1 10 100 Base TX...
Page 64: ...PDS Series User Manual V1 4 Oct 2009 64 Digital Output...
Page 66: ...PDS Series User Manual V1 4 Oct 2009 66 PDSM 700 PPDSM 700 MTCP...
Page 67: ...PDS Series User Manual V1 4 Oct 2009 67 PPDS 700 IP67...
Page 68: ...PDS Series User Manual V1 4 Oct 2009 68...
Page 69: ...PDS Series User Manual V1 4 Oct 2009 69 Din Rail Mounting Stack Mounting...
Page 91: ...PDS Series User Manual V1 4 Oct 2009 91...
Page 147: ...147 Init Mode Short INIT and GND PDSM 700 D PPDSM 700 D MTCP Run Mode Open INIT...
Page 152: ...PDS Series User Manual V1 4 Oct 2009 152 Example...
