ABB 615 Series ANSI, Manual

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1MAC052634-MB D
Section 3
Vendor-specific implementation
615/620 series ANSI 25
Communication Protocol Manual
on the command termination confirmation. In secured operation mode, the Modbus
command response is always based on the termination confirmation.
The update of the SSR6 bits (sequence command state) is based on the
termination confirmation in both operation modes. If a new control operation is issued by
the client before the previous command has been concluded, that is before the SSR6 has
been updated, the operation is rejected because the command operation still in progress.
Location of control structures
One or several control structures may be defined in the IED. If there are several control
structures, they are located one after another in the Modbus 4X memory map. Refer to the
IED's Modbus memory map for the actual locations of control structures.
3.3.7 System status registers
See Modbus ANSI point list manuals for specific register locations.
Table 13: System status registers
3.3.7.1 SSR1
The bits in SSR1 are common for all Modbus clients. The bits in SSR1 give an overview
of the IEDs health. If a specific bit in this register is “1”, it signifies a warning or an error
in the hardware entity in question.
Register Description Address
SSR1 Device health 4xxxx + 1
SSR2 Device mode 4xxxx + 2
SSR3 Data available 1 4xxxx + 3
SSR4 Data available 2 4xxxx + 4
SSR5 Device alive counter 4xxxx + 5
SSR6 Last command result 4xxxx + 6
More specific warning and error codes can be read from elsewhere in the
Modbus memory. Refer to the Modbus memory map for these register
locations.