Safety Network Number

Use the General > Safety tab of the CIP Safety device DTM to configure a Safety Network Number (SNN) for the safety device. The SNN is used to set the Target Unique Network Identifier (TUNID). TUNID identifies the CIP Safety device, and is an essential component of the Type 2 SafetyOpen Request issued by the originator CPU to initiate a CIP Safety connection.

Configuring the SNN

The SNN is a hexadecimal value that is part of both the CIP Safety connection configuration (configured using Control Expert) and the CIP Safety device configuration (configured using an SNCT). Typically the SNN is generated in Control Expert, and is copied to (or re-entered in) the SNCT. The SNCT then produces the TUNID based on SNN and IP address and transfers this value to the CIP Safety device.

It is also possible to send the SNN directly from the CIP Safety connection DTM in Control Expert to the target device.

To configure the SNN:

Step

Action

1

In the General > Safety tab, click the ellipsis (...) button. The Safety Network Number dialog opens.

2

In the Safety Network Number dialog, select one of the following:

  • Time-Based:To generate a hex value based on the month, day, year, hour, minute, second and millisecond at the time of generation.

  • Manual: To generate a value based on an input decimal value of 1 to 9999, which is concatenated with two hexadecimal values, as follows:

    • word 1: 0004 (fixed)

    • word 2: 0000 (fixed)

    • word 3: 0001...270F (the hexadecimal value of the 1...9999 input value)

  • Vendor Specific: A vendor specific identifier based on 3 input hexadecimal words:

    • word 1: 05B5...2DA7 (from vendor)

    • word 2: 0000 (fixed)

    • word 3: 0001...270F (from vendor)

  • A directly entered hex value (typed or pasted), consisting of:

    • word 1: 2DA8...FFFE

    • words 2 & 3: 00000000...05265BFF

3

For a Time-Based, Manual or Vendor Specific format, click Generate . If you directly entered a hex value, click Set.

4

Click OK to save the SNN and close the dialog. The SNN appears in the Safety network Number field.

Configuring the SCID

The SCID, also called the Configuration Signature, it is set in the vendor provided safety network configuration tool (SNCT) and represents the unique hexadecimal configuration identifier for the CIP safety device. It is a concatenation of:

  • The Safety Configuration CRC (SCCRC): This is a cyclic redundancy check (CRC) value of the safety device configuration settings, in the form of a hex value consisting of 4 octets.

  • Safety Configuration Time Stamp (SCTS): This is a date and time hexadecimal value timestamp that consists of 6 octets.

To input the SCID:

Step

Action

1

Obtain from the device configuration made using the SNCT, the following:

  • The SCCRC

  • The date (mm/dd/yyyy), time (hh/mm/ss/ms) the SNCT configuration was performed.

2

Select Configuration Signature.

3

Enter the SCCRC into the ID field.

4

Enter the date and time values into the Date and Time fields.
NOTE: If you configure safety connections with an SCID = 0 ("configure SCID disabled"), note that you are responsible for verifying that the M580 safety originator and the CIP Safety targets have the correct configurations.