8 •
750-491 [1 AI DMS]
Display Elements
WAGO-I/O-SYSTEM
750
I/O
Modules
Due to the accurate measurement of supply voltage as well as bridge voltage
in one measurement transformer, long-term and temperature drift are compen-
sated.
If the internal voltage supply (U
V
) is overloaded (I
load
> 20 mA), an external
power supply is necessary. (cf. chapter 2.1.1.9, “Connection examples”).
Any configuration of the input modules is possible when designing the
fieldbus node. Grouping of module types is not necessary
The voltage supply is done via system voltage.
Attention
This module has no power contacts. For field supply to downstream I/O
modules, a supply module will be needed.
The analog input module 750-491 and its variations can be used with all
couplers/controllers of the WAGO-I/O-SYSTEM 750 (except for the economy
types 750-320, -323, -324 and -327).
2.1.1.4 Display Elements
LED
Channel
Meaning
State
Function
off
No operational readiness or the
internal data bus communication is
interrupted
A
green
Function
on
Operational readiness and trouble-free
internal data bus communication
off Normal
operation
B
red
U
D
Error
on
Brigde voltage U
D
outside of the valid
range or broken wire
off
No operational readiness or the
internal data bus communication is
interrupted
C
green
Function
on
Operational readiness and trouble-free
internal data bus communication
off Normal
operation
13
14
C
D
B
A
D
B
C
A
Fig. 2.1.1-1: Display
Elements
g045202x
D
red
U
ref
Error
on
Voltage supply U
ref
outside of the valid
range
