LF: Ping

Parameter Name

Purpose

A

Sender IP: CPU or Panel

This is the IP which sends the Ping

B

Destination: IP to Ping

Enter the IP of the remote device to Ping.
You can enter the IP directly in the field, create a constant and enter the IP as a Power-up value, or link a data tag.

C

TimeOut: milliSec

Determines how long the controller will wait for a response from the remote device.

D

Ping in Progress

Turns OFF when the first of these events occurs:
- The remote device answers the Ping
- The TimeOut has been exceeded

E

Success Bit

Turns ON when the remote device answers.
Reset by user.

F

Error code

Ping supports the standard ICMPv4 Destination Unreachable Message Subtypes listed in the following table.

G

Remote IP

The IP of the device that answered the Ping.

Error Codes (ICMPv4)

Purpose

-2

Timeout exceeded– no reply at all

-1

No error

0

Network Unreachable

The datagram could not be delivered to the network specified in the network ID portion of the IP address. Usually means a problem with routing but could also be caused by a bad address.

1

Host Unreachable

The datagram was delivered to the network specified in the network ID portion of the IP address but could not be sent to the specific host indicated in the address. Again, this usually implies a routing issue.

2

Protocol Unreachable

The protocol specified in the Protocol field was invalid for the host to which the datagram was delivered.

3

Port Unreachable

The destination port specified in the UDP or TCP header was invalid.

4

Fragmentation Needed and DF Set

Normally, an IPv4 router will automatically fragment a datagram that it receives if it is too large for the maximum transmission unit (MTU) of the next physical network link the datagram needs to traverse. However, if the DF (Don't Fragment) flag is set in the IP header, this means the sender of the datagram does not want the datagram ever to be fragmented. This puts the router between the proverbial rock and hard place, and it will be forced to drop the datagram and send an error message with this code.

This message type is most often used in a “clever” way, by intentionally sending messages of increasing size to discover the maximum transmission size that a link can handle. This process is called MTU path discovery.

5

Source Route Failed

Generated if a source route was specified for the datagram in an option but a router could not forward the datagram to the next step in the route.

6

Destination Network Unknown

Not used; Code 0 is used instead.

7

Destination Host Unknown

The host specified is not known. This is usually generated by a router local to the destination host and usually means a bad address.

8

Source Host Isolated

Obsolete, no longer used.

9

Communication with Destination Network is Administratively Prohibited

The source device is not allowed to send to the network where the destination device is located.

10

Communication with Destination Host is Administratively Prohibited

The source device is allowed to send to the network where the destination device is located, but not that particular device.

11

Destination Network Unreachable for Type of Service

The network specified in the IP address cannot be reached due to inability to provide service specified in the Type Of Service field of the datagram header.

12

Destination Host Unreachable for Type of Service

The destination host specified in the IP address cannot be reached due to inability to provide service specified in the datagram's Type Of Service field.

13

Communication Administratively Prohibited

The datagram could not be forwarded due to filtering that blocks the message based on its contents.

14

 Host Precedence Violation

 Sent by a first-hop router (the first router to handle a sent datagram) when the Precedence value in the Type Of Service field is not permitted.

15

Precedence Cutoff In Effect

Sent by a router when receiving a datagram whose Precedence value (priority) is lower than the minimum allowed for the network at that time.