Specifications

C-17
IP 240
EWA 4NEB 811 6120-02b
Start-up Program and Error Responses
The start-up program is located in OB 100. When OB 100 has been pro-
cessed, you can check the following entries with “Monitor/Modify variable”:
 DB 172.DBB 2 to DBB 7: Product code of the module
 DB 172.DBB 8 to DBB 13: Firmware version
 DB 172.DBB 14 and DBB 15: Hardware version
 DB 172.DBB 46: B#16#02 (“Counting” mode)
 DB 172.DBW 48: Data block number
 DB 172.DBW 52: Basic address of the module
The actual value
 DB 172.DBD 60: (BCD-coded) or
 DB 172.DBD 64: (binary-coded)
is the count starting value, which is transferred to the module when the data
block is started up.
If all inputs show the signal state ‘0’, no output may be activated.
If an error or fault occurs during execution of the start-up program, the cyclic
block calls are no longer processed; the error memory bit.
After every block call in the cyclic program, an error memory bit is set when
an error occurs (BR = ‘0’), which in turn causes the group error message to
be signalled at output Q3.7 (M 171.7).
In the case of a group error message, the associated error bit indicates which
block call has caused the error. A precise description of the error can be
found in the corresponding PAFE byte and in the error words of the data
block (see the IP 240 Manual, Sections 8.3.1 “Configuring Function Block”
and 8.3.2 “Control Function Block“).
Start-up Program
Responses to
errors
IP 240 Counter, Position Decoder and Positioning Module