10/24-4.10 EN Rev. 9 EasyLine EL3000 Series Data Sheet 19
I/O modules
Digital I/O module
Digital inputs (DI1–DI4)
Optocouplers with internal 24 VDC power supply. Control with
floating contacts, with external voltage 12–24 VDC or with
open collector drivers PNP or NPN.
Digital outputs (DO1–DO4)
Floating double-throw contacts, max. contact load rating
30 VDC/ 1 A
Relays must at all times be operated within the specified data
range. Inductive or capacitive loads are to be connected with
suitable protective measures (self-induction recuperation
diodes for inductive loads and series resistors for capacitive
loads).
Terminal assignment
Digital input and output signals Standard assignment
1)
digital I/O module
1 2
Failure
Maintenance request
Maintenance mode
Overall status DO1
Start automatic calibration DI1
Stop automatic calibration
Disable automatic calibration DI2
Sample gas valve DO4
Zero gas valve
Span gas valves 1–5
Pump on/ off
2)
Limit 1 DO2
Limit 2 DO3
Limit 3 DO1
Limit 4 DO2
Limit 5 DO3
Limit 6 DO4
Limit 7
Limit 8
Limit 9
Limit 10
Measuring range switch-over
Measuring range feedback
Bus DI 1–8
External failure
3)
DI3
External maintenance request
3)
DI4
1) Factory-set, can be changed by on-site configuration
2) When a pump (integral gas feed) is installed
3) Multiple external status signals can be configured
depending on the number of free digital inputs.
Electrical connections
See connection diagram
Design: 2x12-pin terminal strip. Observe the notes regarding
I/O module connection (see page 17)!
Rel
ays are shown in the unpowered state. The unpowered
state is the failure mode.
Connection diagram
2
1 3 5 7 9 11131517192123
4681012141618202224
DI4 D
3D
2D
1D
4DI3 DI2 DI1
13
15
17
14
16
18
19
21
23
20
22
24
DO4 NO
Common
NC
DO3 NO
Common
NC
DO2 NO
Common
NC
DO1 NO
Common
NC
1
2
3
5
6
4
7
8
9
11
12
10
max. 30 V / 1 A
max. 30 V / 1 A
max. 30 V / 1 A
max. 30 V / 1 A
DI4 -
DI3 -
DI2 -
DI1 -
+
+
+
+
GND
GND
GND
GND
24V
24V
24V
24V
12-24 V
12-24 V
12-24 V
12-24 V
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