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Settings at the RTD box for RS485 connection
If temperature detectors are used with two-wire connection, the line resistance (for short-circuited temperature
detector) must be measured and adjusted. For this purpose, select mode 6 in the RTD-box and enter the re-
sistance value for the corresponding temperature detector (range 0 to 50.6 Ω). If a 3-wire connection is used,
no further settings are required to this end.
The values in the following table are applicable for setting the bus address at the RTD box. The default setting
in DIGSI is 6 RTD HDX. For simplex operation, set the address at the RTD box to 0 and activate the parameter
191 6 RTD simplex in DIGSI.
Table 2-19
Further information is provided in the operating manual of the RTD-box.
Settings at the RTD box for Ethernet connection
The RTD box is put into operation using Web Browser Interface via PC. The procedure for starting up the RTD
box is described in detail in the manual supplied with the RDT box.
When using temperature sensors with 2-wire connection, proceed as described in the section "Settings at the
RTD box for RS485 connection". The settings can be changed either directly at the device or via the Web
Browser Interface.
Processing Measured Values and Messages
The RTD box is visible in DIGSI as part of the 7SK80 device, i.e. messages and measured values appear in
the configuration matrix just like the internal functions and can be allocated and processed in the same way.
Messages and measured values can thus be forwarded to the integrated user-defined logic (CFC) and inter-
connected as desired. Pickup signals „RTD x St. 1 p.up" and „RTD x St. 2 p.up", however, are
neither included in the group alarms 501 „Relay PICKUP" and 511 „Relay TRIP" nor do they trigger a trip
log.
If it is desired that a message should appear in the event log, a cross must be entered in the intersecting box
of column/row.
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
Setting the bus address at the RTD box 7XV5662
Mode
simplex
half duplex
2.17 Temperature Detection via RTD Box
Address
RTD 1 to RTD 6: 0
RTD 1 to RTD 6: 1
RTD 7 to RTD 12: 2
Functions
249
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