ABB SM500F Commissioning Instructions page 9

Connections
Rx/Tx +
Rx/Tx –
Gnd
Dig IP/1
Dig IP/2
Dig
Com
F
Ethernet / Modbus
and digital input
ABCD
Single input
THC / mV / V
digital input
1
Current
3
R/RTD 3
2 3
RTD 4
1 2 3
1 2 3 4
A
*In the powered-down condition the current input is open circuit. In order to maintain a current loop when the
recorder is powered down, fit a zener diode (BZX79 – B/C2V4) to the input as shown.
Fig. 7 Electrical connections
IMPORTANT (NOTE) Tighten power supply terminal
screws to a torque of 0.8 Nm (7 lbf.in). Tighten all other
terminal screws to a torque of 0.5 Nm (4.5 lbf.in).
CI/SM500F–EN Rev. A
A
BCD
Dual input
THC / mV / V
digital input
4
1/3 2/4
Current
4
1/3 2/4
4
I/P 2
I/P 1
4 1 2 3 4
1 2 3 4 1
B
F
G
D E
B C
D
24 V Tx PSu
NO
1 2 3 4
D
Dual relay
NC
NC
LK2
LK1
Relay 1
Relay 2
Relay 1
C NO/NC
Relay 2
C NO/NC
1 2 3 4
2 3 4
1 2 3
C D
E G
Relay
Power
Supply
NO
LK1
NC
10 to 36 V DC
100 to 240 V AC
Relay
C NO/NC
1 2 1
1 2 3
1 2
4
E G
or
2 3
9