ABB REG316 4 Series Operating Instructions Manual page 699

REG 316*4 1MRB520049-Uen / Rev. E
9.4. Synchronisation
The internal clock is synchronised either by the station control
system (SCS 100) or a radio clock (DCF77). Synchronisation via
the IBB takes priority over synchronisation by the HMI.
After the device is switched off and on again, the clock continues
at the time before it was switched off until the next time telegram
is received.
9.5. SPA bus address format
The structure of the SPA bus telegram is as follows:
<slave address><operation><channel No.><data type><data/event No.>
The slave address identifies the device.
The default address is 2. The slave address can be changed
using the operator program (HMI). The HMI has to be used to
assign an address to the device as defined in the station control
system. The device also responds to data with the address 900
which is used to synchronise all the devices in an SPA bus loop
simultaneously.
Possible operations are:
Read data from the device (R) and write data in the device (W).
The channel number identifies the active functions.
All channel numbers from 0 to 13 are reserved for system func-
tions. Channel numbers from 14 to 60 are used for numbering
the protection and control functions configured for the device.
Data type enables the different kinds of data in a device to be
addressed specifically. The following types of data are used:
S settings
I binary or analogue inputs
O binary or analogue outputs
E single events
V measurements, system variables and event masking
Q measurements stored at the instant of tripping
T time
D date
L event memory
B back-up event memory.
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