Lenze DDS System bus CAN for PLC - Manual (Page 11)

System bus (CAN) for Lenze PLC devices
Preface and general information
1.1 About this Manual
1−3
L
PLC−Systembus EN 2.0
1.1.2 Structure of the description
The descriptions of the individual functions/function blocks as well as of system blocks contained
in this Manual have the same structure:
†
ƒ

„
‚
 Headline with SB identifier
‚ SB function and node number
ƒ Short description of the SB and its most important features
„ System block chart including all corresponding variables
·
Input variables
·
Output variables
Table giving information about input and output variables:
·
Identifier
·
Data type
·
Signal type
·
Address
·
Display code
·
Display format
·
Information
† Detailed functional description of the SB
Information on return values for a function
If it was not possible to carry out a function faultlessly, a negative return value is sent back,
representing an error number.
·
Each error number is assigned to a corresponding error cause in the Meaning column.
·
If different error numbers (−1, −2, ...) may apply, a specific digit (1, 2, ...) in the Priority column
additionally is assigned to the error number.
– The smaller this digit, the higher is the priority of the associated error number.
– If several error causes are available at the same time when a function is carried out, always
the error number with the highest priority is returned by the function.