Process interfacing via an automation system (PLC, PC)
9.4 Control with FB 79
SIMATIC MV500
Operating Instructions, 06/2018, C79000-G8976-C494-01
137
STL program
Table 9- 42 Structure of the STL program
//Enter data ID (in principle only necessary in the first cycle)
L
B#16#81
// Only result string
T
AB 8
// Check number of data packet for 1
L
EB 5
// No. of the data packet from the optical reader
L
1
<>
I
// If no. ≠ 1
SPB
m001
// ... user data is not available yet
// Import user data from the optical reader
L
ED 9
// Read first 4 bytes of user data
T
DB17.DBD 4
// Store in DB
L
ED 13
// Read next 4 bytes of user data
T
DB17.DBD 8
// Store in DB
L
ED 17
// Read next 4 bytes of user data
T
DB17.DBD 12
// Store in DB
L
ED 21
// Read next 4 bytes of user data
T
DB17.DBD 16
// Store in DB
L
ED 25
// Read next 4 bytes of user data
T
DB17.DBD 20
// Store in DB
L
ED 29
// Read next 4 bytes of user data
T
DB17.DBD 24
// Store in DB
L
EW 33
// Read second last 2 bytes of user data
T
DB17.DBW 28
// Store in DB
L
EB 35
// Read last byte of user data
T
DB17.DBB 30 / // Store in DB
// Acknowledge with no. of data packet
m001:
L
EB 5
// Number of data packet
T
AB 5
// Send as acknowledgment to optical reader
BEA
