The ASC can use its Modbus server interface to control the PV/ESS. The ASC calculates references for the PV/ESS plant and makes them available for the PV/ESS controller. The PV controller measures or calculates PV/ESS plant statuses and these are read by the ASC. Modbus addresses 46000 to 46999 (function code 0x03) are used for this.
The DEIF open protocol includes the following function groups:
- Read area 1 (ASC to PLC/external system) (from 46000): The ASC puts data here for the PV/ESS controller to read.
- Write area 1 (PLC/external system to ASC) (from 46100): The PV/ESS controller writes data here for the ASC to read.
- Read area 2 (ASC to PLC/external system) (from 46200): The ASC puts data here for the PV/ESS controller to read.
- Read/Write (Battery) (from 46300)
Note: The ASC Solar controller can still use the DEIF Open protocol even if
the PV protocol selection in parameter 7561 is not DEIF Open.
Note: The ASC Storage controller can still use the DEIF Open protocol even
if the ESS prot. selection in parameter 7561 is not DEIF Open.