ABB FPTC-02 - Wiring Example 3

￭ Wiring example 3
With an external safety relay, two-channel connection. This connection
is SIL2 capable (redundancy between STO channels).
11
12
21
22
XSTO1
PTC
XSTO
T1 T2
XFLT
FPTC
OUT
SGND
IN1
IN2
SLOT
1/2/3
X100
XSTO2
1
2
3 ~
Ex M
3
Control unit1
External safety relay2
Potentially explosive atmosphere3
Electrical installation 45