ProMinent DULCO flex Control Original Operating Instructions page 26

Supplementary operating instructions for Modbus RTU
2
3
4
P_BE_0059_SW
Fig. 6: Socket assignment on the
pump
P_BE_0060_SW
Fig. 7: Plug assignment on the CAN
cable
26
The following requirements apply for the connecting cables /
Modbus interface:
Half-duplex, 2-wire technology, "twisted pair" cable
n
Max. cable length 1200 m
n
RS-485 (TIA-485-A)
n
Differential voltage level ± 5 V
n
Active termination (terminating resistor)
n
Tab. 23: Connection assignment for Modbus RTU
1
Pin
1
2
5
3
4
5
CAUTION!
Pump may be damaged.
IP65 degree of protection cannot be guaranteed if
the CAN cable is not correctly screwed in.
– Manually screw in the CAN cable threaded
connectors until they reach the stop.
If the Modbus pump is connected to the end of the
Modbus, the Modbus PCB's integrated terminating
resistor can be switched on via the metering
pump's menu - there is then no need for a sepa‐
rate terminating resistor screwed to the end.
Lead colour
-
-
blue
black
grey
PLC terminal
-
-
GND
A
B