Operating Instructions

Table Of Contents
To simulate a user-defined mA value:
1. Open the menu Device - Simulate AO.
2. Select Other, enter the simulated value, and click on OK. The message 'Field Device fixed
at new value' appears. Click on OK.
3. When you are ready to end simulation, select End and click on OK to return the device to the
original output level.
7.1.5.15 HART Communication
Sets the number of request/response preambles (default 5).
The preamble consists of three or more hexadecimal FF characters (all 1s). This allows the
receiving modem to get its frequency-detection circuits synchronized to the signal after any
pause in transmission.
We recommend you do not change the default value (5).
7.1.5.16 How to set the device address
The default address for the device is 0. To reset the address via the handheld programmer
see Device Address. (Page 111)
Operating
7.1 Operating via SIMATIC PDM
SITRANS LR260 with mA/HART
Operating Instructions, 11/2019, A5E32337683-AD 71