Operating As A Profile Device; Configuring A New Device; Configuring Profibus Pa With An S7-300/ 400 Plc; Cyclic Versus Acyclic Data - Siemens SITRANS L Operating Instructions Manual

PROFIBUS communication
E.8 Operating as a profile device
E.8

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.
The device can be identified in one of three ways:
*
Defining the device as Profile-specific as opposed to Manufacturer-specific makes it possible
to exchange the device for any other device of the same profile type without changing the
GSD file.
To set up the device as a profile device, see PROFIBUS Ident Number (5.2.).
E.9

Configuring a new device

See Configuring a new device (Page 57).
E.10

Configuring PROFIBUS PA with an S7-300/ 400 PLC

1. If SITRANS LR200 is not listed in the STEP 7 device catalog, you can download the GSD file
from the Siemens Web site and import it into Step 7. Go to LR200
(www.siemens.com/LR200), and click Downloads.
2. Add the SITRANS LR200 "rack", click and drag the SITRANS LR200 folder from the hardware
catalog.
3. Fill the rack with the necessary modules by dragging and dropping them from the hardware
catalog.
4. After configuring PROFIBUS PA in steps 2 and 3, download it to the PLC.
5. Add code to the PLC program to read data consistently using the SFC14.
E.11

Cyclic versus acyclic data

When you request data from a device via PROFIBUS PA, you have two choices. Cyclic data is
provided at every bus scan: acyclic data is requested and provided as needed.
Input information is always requested at every bus scan and is set up as cyclic data.
Configuration information is only needed periodically and is set up as acyclic data.
202
Device Identification
STD PROFILE
MANUFACTURER
STD – AIFB 1 ONLY
Profile Model
Standard Profile (uses generic GSD for 2 AIFB [ident # = 0x9701]
Manufacturer-specific (uses Siemens EDD and GSD file, which identi-
fies the LR250 [PROFIBUS PA]) [ident # = 0x8150]
Standard Profile AIFB 1 only (uses generic GSD for 1 AIFB) [ident # =
0x9700]
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF