Bus Termination; Power Demands; Profibus Address; Operating As A Profile Device - Siemens sitrans LR200 Instruction Manual

Bus Termination

PROFIBUS PA MUST be terminated at both extreme ends of the cable for it to
Note:
work properly. Please refer to the PROFIBUS PA User and Installation Guidelines (order
number 2.092), available from www.profibus.com.

Power Demands

To determine how many devices can be connected to a bus line, calculate the combined
maximum current consumption of all the connected devices: 10.5 mA for SITRANS LR200.
Allow a current reserve for safety.

PROFIBUS address

A unique PROFIBUS address identifies each device on the network. To set the PROFIBUS
address see Device Address (5.1.) on page 89.
Notes:
• It is possible to change the device address via a Class 1 master (for example, a PLC)
and lock the device address to prevent further changes.
• If this Address Lock is on, the PA address cannot be changed. This lock can be
disabled only by performing an Address Reset.
Resetting the PROFIBUS address to 126:
• Via SIMATIC PDM:
a) Open the menu Device – Device Reset and click on Reset Address to 126.
b) Click on OK: the address will be reset to 126, and if the address lock was on, it
will be disabled.
• Via the handheld programmer:
a) Navigate to Service (4.) > Device Reset (4.1.). (You can enter the numeric value
instead of navigating via the Arrow keys.)
b) Press RIGHT Arrow to open Edit Mode then scroll down to DEV ADDRESS and
press RIGHT Arrow to select it. The address will be reset to 126, and if the
address lock was on, it will be disabled.
c) Press LEFT Arrow to exit.

Operating as a Profile Device

Every manufactured PROFIBUS product has a unique PROFIBUS identification number
which identifies it to the system. PROFIBUS Profile Standard version 3.01 also defines a
Profile Model which can identify a product as a generic profile device on the network.
7ML19985JR01 SITRANS LR200 (PROFIBUS PA) – INSTRUCTION MANUAL Page 129