Appendix C Technical data for the 7951
Page C.3
•POWER SUPPLIES Inputs d.c. only
Outputs d.c. only. These provide power within the 7951 and to
some other external devices such as transducers.
Isolation
notes
The isolation between the enclosure and all DC power
inputs, signal inputs and signal outputs is: 50VDC
continuously OR 125VDC for less than 15 seconds.
Consequently, isolation between any two signal lines
and any DC power line is:
100VDC continuously OR 250VDC for less than 15
seconds.
C.4 Maximum number of external connections The table below lists the maximum number of external connections which you can make to a single 7951.
(1) Use ordering code 7951MAA*38N** for Klippon option 1 only, or 7951MAA*38H** for both Klippon options 1 and 2.
(2) Use ordering code 7951MAB*38N** for D-type option 1 only, or 7951MAB*38H** for both D-type options 1 and 2.
Maximum number
Standard Option 1 Extra I/O
Type of connection
Klippon D-type Klippon D-type
Inputs
Analogue (Non-SMART ) 4 4 4 1 6
2
Pulse 1 2 0 0
Time period 4 4 0 0
Status 6 10 0 8 2
Outputs
Analogue 4 4 4 1 4
2
Pulse 3 5 0 0
Status 6 9 0 8 2
Serial Communications
RS232 1 1 0 0
RS232/485 2 2 0 0