Note
Ensuring the function of digital inputs
An open input is interpreted as "low".
Terminal M1 must be connected so that the digital inputs (DI) can function.
This is achieved by using one of the following measures:
1. Providing the ground reference of the digital inputs
2. A jumper to terminal M
Note: This removes isolation for these digital inputs.
5.2.2.4 X521 analog inputs
Table 5-12 X521: Analog inputs
Terminal Designation
1)
Technical data
1 AI 0+ The analog inputs can be toggled between current
and voltage input using switches S5.0 and S5.1.
As voltage input:
-10 ... +10 V; R
i
> 100 kΩ
Resolution: 11 bits + sign
As current input:
-20 ... +20 mA; R
i
= 250 Ω
Resolution: 10 bits + sign
2 AI 0-
3 AI 1+
4 AI 1-
5 P10 Auxiliary voltage:
P10 = 10 V
N10 = -10 V
Current-carrying capacity: max. 3 mA
Continuously short-circuit proof
6 M
7 N10
8 M
Type: Screw terminal 1
1)
AI: analog inputs; P10/N10: auxiliary voltage; M or GND: ground reference
NOTICE
Damage or malfunctions through impermissible voltage values
If a current exceeding ±35 mA flows through the analog current input, then the component
could be destroyed.
The common mode range must not be violated in order to avoid incorrect analog-digital
conversion results.
● The input voltage may only be in the range between -30 V and +30 V (destruction limit).
● The common mode voltage may only be in the range between -10 V and +10 V (error limit).
● The back EMF at the auxiliary voltage connections may only be in the range between -15
V and +15 V.
Terminal Modules
5.2 Terminal Module TM31
Supplementary component descriptions
64 Manual, 06/2019
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