Settings; Safety-Related Characteristics - ABB 265Ax Safety Instructions

Pressure Transmitter Series 2000T and 265Ax, 265Gx, 265Vx, 265Dx, 265Jx, 267Cx, 269Cx
Instructions for Functional Safety

11 Settings

11.1 Alarm behavior and current output
In case of a malfunction the current is set to the selected value. The settings can be made via the ABB user interface
DSV401 (SMART VISION) or via a hand-held terminal.
NOTICE
Check the safety function upon entry of all parameters. The transmitter allows to simulate the signal current inde-
pendently of the measured pressure by using the "Simulation" and "Simulate current" parameters. (These parame-
ters are accessible via DSV401 (SMART VISION) or via the HART hand-held terminal.
11.2 Locking/Unlocking
WARNING
Any changes to the measuring system and its settings after commissioning may impair the safety function. For this
reason it is strongly recommended to disable local transmitter control via the local keys after having entered all
parameters and after having checked the safety function. This is to protect your settings against unwanted or
unauthorized modification. A lock activated via the local keys can only be deactivated by using the keys again.
Fig. 11-1:

12 Safety-related characteristics

12.1 Assumptions
– HART communication is only used for configuring, adjusting or diagnosing the device, but not for safety-relevant
critical operations.
– Cyclic self-diagnosis is executed within one hour and is automatically restarted.
– The repair time after a device fault is 8 hours.
– The long-time average temperature is 40°C.
– The transmitter is only used for low demand mode applications.
– Only the 4...20 mA current signal is evaluated by the safety device.
– A dangerous failure is a failure where the output current does no longer respond to the input signal or deviates
from it by more than 2% referred to the measuring span.
– The safety PLC must be designed such that it reliably recognizes faults leading to both HI alarms and LO alarms.
7
SM 265/7/9 SIL-EN