7
Analog input / relay / hybrid connections
IMPORTANT (NOTE)
• Tighten terminal screws to a torque of 0.1 Nm (0.9 lbf.in).
• Analog inputs:
– 3-Lead RTD: 3-leads must have equal resistance, not exceeding 20 W each
– for mA input types, to ensure loop continuity when the recorder is switched off, fit a suitably-rated diode
(for example, type 1N4148 or equivalent)
3
11
10
9
8
7
6
5
4
1
2
18
17
16
15
14
13
12
3
11
10
9
8
7
6
5
4
1
2
18
17
16
15
14
13
12
3
11
10
9
8
7
6
5
4
1
2
13
12
L
N
+
–
Tx +
Tx –
Tx / Rx
+
–
3
11
10
9
8
7
6
5
4
1
2
18
17
16
15
14
13
12
+
*
Tx / Rx
1
2
3
4
5
6
1+
2+
3+
4+
5+
Cold junction
*Each thermocouple input must have either a cold junction assembly (part number CM30/0052) or shorting link (part number
RVG200/0118) fitted. Each analog input card with a thermocouple input must have a minimum of 1 cold junction assembly fitted.
Inputs 1 to 6
RTD
R
THC
Volt-free
digital input
mV, V, ma,
digital input (V)
A, B, C, D
Analog Input
A, B, C, D
Relay
C, D
Hybrid
E
Power supply
RJ45
USB
100 to
240 V AC
24 V
DC
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
N/C
N/O
C
N/C
N/O
C
N/C
N/O
C
N/C
N/O
C
N/C
N/O
C
N/C
N/O
C
Analog or digital outputs
Tx PSU
Digital inputs
Common
Communications
common
Figure 5 Analog input / relay / hybrid connections
Connecting a 2-lead temperature transmitter
Figure 6
1
++
+
+
+
_
_
_
_
2
3
1
2
3
4
1
2
3
4
24 V DC
Current limited
to 22.8 mA
maximum
2-wire
transmitter
A, B, C, D
Analog input
Input 1
2-wire
transmitter
Analog
input
Input 1
Hybrid
Analog or digital output 1
Tx PSU 1
Analog or digital output 2
Tx PSU 2
Using an internal Tx power supply or hybrid board
Using an external 24 V power supply
* 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.
Connecting a 2-wire temperature transmitter
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