Rockwell-automation 1756-SYNCH ControlLogix SynchLink Module User Manu Manual de usuario descargar pdf (Pagina 46)

Publication 1756-UM521C-EN-P - July 2004

3-18 SynchLink Module Features

CST and SynchLink Mastership

The SynchLink module can be configured for multiple mastership and

slave roles in respect to the Coordinated System Time and the

SynchLink. Table 3.7 describes the ways you can configure your 1756-SYNCH

module’s role in CST Mastership.

Table 3.7 Possible SynchLink Configurations

This configuration: Means:

Only the Make SynchLink CST Master box is checked.

• This module relays time from the Chassis CST Master to the

SynchLink.

• The SynchLink node clock on this module is the SynchLink

Time Master.

• The chassis where the module resides is the CST Time

Master on SynchLink. Although the chassis establishes the

CST value for the SynchLink, the module is not CST master

of the chassis. In this case, another module (e.g. controller)

sets the CST value for the local chassis.

Both the Make SynchLink CST Master and Make Chassis CST

Master boxes are checked

This module is the System Time Master. It sets the CST for its local

chassis and all devices connected to the SynchLink.

Only the Make Chassis CST Master box is checked.

In this case, you MUST configure the module for its dependence on

SynchLink. The module is a Time Slave on the SynchLink and

depends on the SynchLink fiber optic cable for CST mastership. The

1756-SYNCH module then relays the time from the cable to the

chassis in which it resides, acting as the Chassis CST master. The

1756-SYNCH module’s behavior varies in this configuration,

according to your configuration choices as described in the

following rows

Dependence on SynchLink is Required • The module is a Time Slave on SynchLink.

• The module is the CST Time Master of the local chassis.

• You MUST have selected another module on the fiber optic

cable to be the SynchLink CST Master.

• If communications with the SynchLink CST Master are not

present when the 1756-SYNCH module powers up,

CST-dependent features will not start operating until the

communications to the SynchLink CST Master are restored.

• If communications with the SynchLink CST Master are

broken after operation has begun, the 1756-SYNCH module

stops relaying time to this chassis, and there will be no CST

signal in the chassis.

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