Siemens SIMATIC S7-1200 Manual page 18

4 Mode of Operation
4.2 SIWAREX blocks
The call of the FB8 is in OB1.
Figure 4-2
Interface
Table 4-1
Name
Input ADDR
HW_ID
DB_SCALE
Output LIFEBIT
The communication between controller and weighing module requires 32 byte in
the input and output area of the S7-1200 CPU.
Parameter ADDR, as well as the hardware identifier has to match the real
addressing in the device view of the SIWAREX WP231 weighing module, menu
item "I/O addresses" and "Hardware identifier" in STEP 7 V14.
Figure 4-3
Weighing, Controlling and Logging (Set 6)
Entry ID: 82454336, V2.0,
Data
type
DInt
HW_IO
Int
Bool
10/2017
Description
Start address of the I/O area of the WP231
Hardware identifier of the SIWAREX WP231
Data block number of the instance DB
Toggle bit to check communication
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