Setting The Profibus Address; Bus Termination; Power Demands; Cyclic Versus Acyclic Data - Siemens Pointek CLS200 Operating Instructions Manual

9.1.3

Setting the PROFIBUS address

When your instrument is shipped, the PROFIBUS PA address is set to 126. You can set it locally
(see Mode 15: Node address (default: 126) (Page 45)) or remotely via the bus, using a
parameterization tool such as SIMATIC PDM or HW-Config.
When cyclic data transfer with a Class 1 Master is in process, the address can only be changed
via the bus.
Bus address (Device Address)
Values
9.1.4

Bus termination

Note
PROFIBUS PA MUST be terminated at both extreme ends of the cable for it to work properly.
Please refer to the PROFIBUS PA User and Installation Guidelines (order number 2.092),
available from www.profibus.com (www.profibus.com).
9.1.5

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 (12.5 mA for Pointek CLS200/
300). Allow a current reserve for safety.
9.1.6

Cyclic versus acyclic data

When data is requested from a device via PROFIBUS PA, there are two data transfer methods.
Cyclic data is requested and provided at every bus scan: acyclic data is requested and
provided as needed.
• Input and output information is always requested at every bus scan and is set up as cyclic
data.
• Configuration and maintenance information is needed infrequently, and is set up as
acyclic data.
Acyclic data transmission
Pointek CLS200/300 supports up to four simultaneous connections by a Class 2 Master (C2
connection). It supports one connection by a Class 1 Master (C1 connection).
Pointek CLS200/CLS300 digital
Operating Instructions, 05/2021, A5E47904060-AA
Range: 0 to 126 (recommended setting between 1 and 125)
Pre-set: 126
Remote operation
9.1 SIMATIC PDM
63