FCU 500, FCU 505 · Edition 02.17 66
Fieldbus communication via Ethernet
PLC output information (FCU ➔ PLC)
This module/register transfers information on signals
which the PLC uses to control the FCU back to the PLC.
This allows the signal transfer from the PLC to the FCU
to be checked.
Bit Byte n Format
0 Reset BOOL
1 Start BOOL
2 Controlled air flow BOOL
3 Operating signal BOOL
4 Free BOOL
5 Free BOOL
6 Open control element, three-point step Open
1)
BOOL
7 Close control element, three-point step Close
1)
BOOL
1)
Only with three-point step control via bus.
FCU input terminal information
(FCU ➔ PLC)
This module/register transfers the signal states of the
digital inputs on the FCU (input terminals) to the PLC.
Bit Byte n Byte n+1 Byte n+2 Format
0 Terminal 1 Terminal 48 Terminal 68 BOOL
1 Terminal 2 Terminal 49 Free BOOL
2 Terminal 3 Terminal 50 Free BOOL
3 Terminal 4 Terminal 51 Free BOOL
4 Terminal 44 Terminal 52 Free BOOL
5 Terminal 45 Terminal 65 Free BOOL
6 Terminal 46 Terminal 66 Free BOOL
7 Terminal 47 Terminal 67 Free BOOL
FCU output terminal information (FCU ➔ PLC)
This module/register transfers the signal states of
the digital outputs on the FCU (output terminals) to
the PLC.
Bit Byte n By te n+1 Format
0 Terminal 13 Terminal 53 BOOL
1 Terminal 14 Terminal 54 BOOL
2 Terminal 15 Terminal 55 BOOL
3 Terminal 16 Terminal 56 BOOL
4 Terminal 17 Terminal 57 BOOL
5 Terminal 18 Terminal 58 BOOL
6 Terminal 41
1)
Free BOOL
7 Terminal 42 Free BOOL
1)
Only for FCU..F2: terminal 53 is used as an input.
Bit 6 has no function.
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