Operating Instructions
IS1 PROFIBUS 3.00 E
- Technical alterations reserved -
80
PROFIBUS DP interface for IS1+
Data format
HART variables are transmitted as IEEE floating-point numbers (4 byte).
If a HART variable cannot be read (e.g. HART device undergoing startup, not connected, defective or HART
variable not found, ... ), value 7F A0 00 00 (Not a Number) is transmitted. This may be evaluated in the AS for
generation of a signal status of the HART variables. Detailed status and diagnostic information of the HART
field devices can be evaluated via HART Management Systems.
Selection of the HART variables
Up to 8 HART field devices can be connected to one HART module of IS1. Since each HART field device may
have up to 4 variables, this mean that a maximum of 32 HART variables are possible per module.
The assignment of 4 or 8 out of these 32 variables to the positions P1 to P8 in the cyclic transmission area of
PROFIBUS DP or to MODBUS Registers can be selected by parameter assignment:
Parameter name
Value
range
Function
Input No. HART device for pos. 1
0 ... 7,
Not used
Selection of the channel No. (input / output No.) of the HART module to which
the HART field device is connected which is to be transmitted at pos. 1.
If ´Not Used´ is selected, value ´Not a Number´ (7F A0 00 00) is transmitted.
Input No. HART device for pos. 2
Selection for pos. 2
. . . . .
Input No. HART device for pos. 4 (8)
Selection for pos. 4 (8)
HART variable for pos. 1
1 … 4
Selection of the variables of the HART field device which is to be
transmitted at pos. 1.
HART variable for pos. 2
Selection for pos. 2
. . . . .
HART variable for pos. 4 (8)
Selection for pos. 4 (8)
