ABB DSCA 121 Current input module

The disabled status is necessary for the CIs to correctly maintain synchronisation between themselves when events are uploaded from one and not the other. • Each CI module that is to be a part of the redundant configuration must be configured for SOE over Modbus using the same values for the Base Address and Block Count. • In the Toolset, 4 integer variables must be defined in the dictionary and assigned a Modbus address that corresponds to the first 4 addresses in the SOE Address Window, starting at the address defined by the Base Address field. These variables will be used by the SOE over Modbus services on each communication module to synchronise the presentation of event data.

Modbus Master

 The Trusted CI may also act as a Modbus Master with the addition of the Processor Interface Adapter T8122 or T8123. See Product Description PD-T812X for details. On a system without the appropriate Processor Interface Adapter connected, the Modbus Master may be configured and downloaded into the Trusted System. However, no communications activity will take place once the system is running. Modbus Master operates on the CI. It is capable of linking to a wide range of external devices using either Serial or Ethernet links, supporting the Modbus RTU protocol (Modicon Open Modbus TCP is not supported). Clicking ’Configure Modbus Master’ opens the Master configuration window.

Modbus Master Configuration Window

 The Modbus Master configuration is hierarchical. The first step is to configure a Master, then to configure the Slaves serving that Master, then configure the messages carrying data to and from each Slave.Create a new Modbus Master by clicking ‘+ Add Master’. This enables the controls to remove the Master, add a Slave responding to that Master, and to remove a Slave. The three configuration tabs (Configuration, Broadcast and Statistics) are now available for the new Master. The Master name can be changed by double clicking on the name or clicking on ‘Change Name’. ‘Save’ stores changes made so far, and ‘Undo’ loads the last saved state. ‘Validate’ will check the settings for any obvious errors and omissions (but will not guarantee it will work).

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