Siemens FS720 Mounting & Installation page 77

6.4.2.4 Extinguishing terminal wiring
Cardcage FCA2046
TERM_INT_VSYS+
TERM_INT_VSYS-
TERM_INT_DATA_A
TERM_INT_DATA_B
TERM_EXT_VSYS+
TERM_EXT_VSYS-
TERM_EXT_DATA_A
TERM_EXT_DATA_B
Building Technologies
Fire Safety
X10 Primary terminal
+ 1 1,2
- 3,4 -
2
1,2
A 3
3,4
B 4
+ 5
-
6
A 7
B
8
Figure 42: Wiring diagram of the primary and secondary extinguishing terminals
Primary terminal
● A maximum of 1 primary terminal may be connected; the address must always
be '1'
● The maximum cable length for the primary terminal is 10 m; twisted and
unshielded cable with min. 7 twists/meter.
The polarity must be observed (A, B) when connecting the data cable.
Secondary terminal
1) The maximum length of the stubs is 20 m for the secondary terminal
2) The line must be terminated at the furthest terminal with 120 Ω (secondary
terminals only)
3) An external power supply, e.g., FP120, is required for long lines or when if back-
up batteries are used.
● The address must always be ≥2; a maximum of 5 secondary terminals must be
connected for each extinguishing card.
● The maximum cable length for the secondary terminal is 1200 m; twisted and
unshielded cable with min. 7 twists/meter.
When using shielded cables, the shielding must be connected on the terminal
side.
● The cable resistance and the capacity is max. 80 Ω (on both sides) and max.
200 nF.
Mounting and installing extinguishing control panels
Extinguishing terminal installation and wiring
+
VSYS_POS
X2
3
VSYS_NEG
A
DATA_A
X1
B
DATA_B
2
1
Optional
Terminal
Power
Supply
Secondary terminal
5
#MAINS
6
#BATTERY
1,2 +
VSYS_POS
3,4 -
VSYS_NEG
1,2
A
DATA_A
3,4
B
DATA_B
A6V10210390_m_en_--
2018-08-29
6
X2
X1
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