ABB REF 542plus, Operator'S Manual, Page: 42 / 134

Usually, the SCADA transmits to the unit the time and date according to the used
protocol services. There are some differences depending on the used protocol.
*
IEC 60870
–
5
–
103 protocol: The IEC 60870
–
5
–
103 module is the time master.
Setting the time and date from the HMI is inhibited.
*
LON LAG 1.4 protocol: The LON module is the time master. Setting the time
and date from the HMI is inhibited.
*
SPA bus and MODBUS protocol: usually, the SCADA sets the time and date,
and setting the time and date from the HMI is inhibited.
42
REF 542plus REF 542plus
Multifunction Protection and Switchgear Control Unit
Operator's manual
1MRS755869