Data type definitions
48
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
3.3 Double-point indication (DP, Input) / Double command (DC, Output)
Number of
byte-values
1
/
4
(2 bits)
Range of values
Figure 3-3 Data type: Double-point indication / Double command
0 (bit 1 = 0 and bit 0 = 0) - "Not applicable" / Intermediate position for DP,
Quiescent status for DC
1 (bit 1 = 0 and bit 0 = 1) -
OFF
2 (bit 1 = 1 and bit 0 = 0) - ON
3 (bit 1 = 1 and bit 0 = 1) - Intermediate position for DP, not permissible for DC
Note:
• Depending on the type, selected in DIGSI, the values 0 and 3 for double-point indi-
cations have the following meaning:
• Type DP: 0 = "Not applicable", 3 = Intermediate position “00” or “11”,
• Type DP_I: 0 = "Not applicable" or Interm. position “00”, 3 = Interm. position “11”.
• "Not applicable": Double-point indication is not configured (not assigned to a binary
input).
Attention!
The data type double command in this chapter presupposes that the associated
checkback indication is parameterized as a double-point indication.
A double command with a single-point indication as checkback indication or without
checkback indication is controlled via PROFIBUS-DP like a single command (ref. to
chap. 3.2), because the treatment of a double command via PROFIBUS-DP depends
on the type of the associated checkback indication.
Bit 1
DP/DC 1DP/DC 2
max. 4 DP/DC per octet/byte
2
0
2
1
2
2
2
7
...2
4
Message head ... ... Message end
Bit 0 Bit 1 Bit 0...
2
3
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