Software Configuration Security - ABB 266 MODBUS User Manual

Putting the transmitter in service
The final procedure to commission the transmitter is to place the transmitter in service. Figure 33 (page 39) shows a view of the
transmitter with a 3-valve manifold. If another type of manifold is used, adjust the procedures accordingly.
IMPORTANT NOTES: Manifold valve positions are not indicative of whether the valve is open or closed.
Some manifold valves are multi-turn, so turning clockwise will close the valve and counterclockwise will open
the valve.
During normal operation the equalizing valves and manifold vent (Figure 33, items A, B, and C) will be closed.
Valves need to be actuated in the following sequence:
1. Verify the high and low pressure tap valve connections on the stream are closed to shut off the process flow (Figure 33,
items L and H).
2. Verify that the equalization valves (items A and B) are open.
3. Verify that the manifold vent valve (item C) is closed.
4. Slowly open the stream tap valves (items H and L) to open the process stream, creating flow. Wait until the system has
pressurized, typically less than 1 minute, before continuing.
5. Close the equalizing valves (items A and B) on the manifold. The transmitter is now commissioned into operation.
Completion of the proceeding sections indicates the transmitter is fully commissioned.

Software configuration security

Following the successful configuration and commissioning of the transmitter, write protection can be enabled. Enabling the write
protection mode will safeguard the transmitter files from being changed or overwritten. DIP switch 5 is used for transmitter write
protection. If DIP switch 5 is ON, the transmitter is in write-protect mode and will not accept write commands. The state of switch
5 may be set before or after power is applied and also at any time during operation of the transmitter. To enable software write
protection security, follow the instructions in section 5.3.1, Enable write protection.
For additional information about DIP switches, go to Appendix B, DIP switch settings.
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 43
4 Transmitter start up