RS-485 communication
Modbus® commands
9.3.1 Device and installation variables
Functions 0x01 and 0x05 are relevant for saving the new installation variables.
Function 0x02
Parameter Format Address Value
The installation was tripped by the TRIP input. bool 5DC 0: Not tripped - 1: Tripped
The installation has changed. bool 7CE 0: Not changed - 1: Changed
Internal error detected in the HR551. bool 7CF 0: Not detected - 1: Detected
Saving the new installation. bool F9F 1: Save the installation
Table 14: Modbus memory mapping: HR551
Function 0x04
Parameter Format Address Value
Device date and time Unit [32] 283C - 283D
Device date
(epoch format)
Serial no. of the HR72x registered in the system chan-
nel
Character string 3458...345E -
Status of the installation Unit [16] 3583 0...5 (Tab. 16)
Status of the HR551 Unit [16] 3584 0...2 ("Fig. X")
ID no. of the HR551 Unit [32] 35E8 - 35E9 -
Serial no. of the HR551 Unit [16] 364C...3652 -
Table 15: Modbus memory mapping: HR551
Possible installation statuses
Value Description
0 Correct installation
1 A new HR72x was detected and added to the system.
2 The HR72x registered in the system is not detected.
3 An HR72x that is not registered in the system was detected.
4 More HR72x than the system can accommodate were detected.
5 No HR72x is registered in the system.
Table 16: Installation statuses
Fehlerstromschutz-Relais 39
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