Difference between revisions of "Blocks IPWatchdog"
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The pulse on '''EXEC''' triggers the IPWDG block. In the beginning ICMP/ARP request is send to the IP address. At the same time '''BUSY''' output changing the status of the log. 0 to 1, '''TMO_S''' running and block is waiting for response. | The pulse on '''EXEC''' triggers the IPWDG block. In the beginning ICMP/ARP request is send to the IP address. At the same time '''BUSY''' output changing the status of the log. 0 to 1, '''TMO_S''' running and block is waiting for response. | ||
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1. If a response is received during '''TMO_S''', '''TMO_S''' is reset. '''BUSY''' is set to log. 0, '''VALID''' is set to 1 (operation successful, output set) and '''Q''' is set to log. 1 (IP is available). | 1. If a response is received during '''TMO_S''', '''TMO_S''' is reset. '''BUSY''' is set to log. 0, '''VALID''' is set to 1 (operation successful, output set) and '''Q''' is set to log. 1 (IP is available). | ||
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2. If the IP response is not received, '''BUSY''' remains in the log. 1 until '''TMO_S''' expires. After '''TMO_S''' expires '''BUSY''' goes to log.0, '''VALID''' goes to log.1 (operation successful, output set). '''Q''' remains in log. 0 (IP is not available). | 2. If the IP response is not received, '''BUSY''' remains in the log. 1 until '''TMO_S''' expires. After '''TMO_S''' expires '''BUSY''' goes to log.0, '''VALID''' goes to log.1 (operation successful, output set). '''Q''' remains in log. 0 (IP is not available). | ||
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'''EXEC''' should be set to a value greater than '''TMO_S''' to avoid unnecessary restart when the block cycle is not completed and waits for '''TMO_S'''. | '''EXEC''' should be set to a value greater than '''TMO_S''' to avoid unnecessary restart when the block cycle is not completed and waits for '''TMO_S'''. | ||
Revision as of 07:35, 15 April 2020
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The pulse on EXEC triggers the IPWDG block. In the beginning ICMP/ARP request is send to the IP address. At the same time BUSY output changing the status of the log. 0 to 1, TMO_S running and block is waiting for response.
1. If a response is received during TMO_S, TMO_S is reset. BUSY is set to log. 0, VALID is set to 1 (operation successful, output set) and Q is set to log. 1 (IP is available).
2. If the IP response is not received, BUSY remains in the log. 1 until TMO_S expires. After TMO_S expires BUSY goes to log.0, VALID goes to log.1 (operation successful, output set). Q remains in log. 0 (IP is not available).
Note:
EXEC should be set to a value greater than TMO_S to avoid unnecessary restart when the block cycle is not completed and waits for TMO_S.
IPWDG_ARP
Returns ARP ping status of given ip address
| Asynchronous interface | ||||
| in | IP_ADDR | string | ip address | |
| in | TMO_S | int | timeout in seconds | |
| out | Q | bool | status | |
IPWDG_ICMP
Returns ICMP ping status of given ip address
| Asynchronous interface | ||||
| in | IP_ADDR | string | ip address | |
| in | TMO_S | int | timeout in seconds | |
| out | Q | bool | status | |
Example
