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ATTRIBUTES EXCEL 50/100/500/600/800
EN2B-0092GE51 R0512 26
Pull-Up Resistor Handling
Table 10. Pull-up resistor handling
device
pull-up
input
circuit
diagram
(Fig. 14)
load-free voltage
voltage hardware
de-
activated
by @ (8)
configured
by DIP
switch
configured
by plug-in
activated
for DI on AI
with NTC
or low-
impedance
input
for voltage
input or
high-
impedance
input
XF830A
10 V
optional
switch-off
YES
NO
NO
YES
case 1
8.89 V
0 V
XFU830A
XF821A
XFL821A YES
XF521,
XF521A
fixed NO NO case 2 8.89 V
XF526
XFL521,
XFL521A/B
optional
switch-off
YES
(3
YES
config.
(6
case 1
0 V
Smart I/O
XFC
5 V YES
(4
YES
(7
case 3 5 V
XL20
10 V
fixed NO
NO
YES case 2
8.89 V
8.89 V
XL50
optional
switch-off
YES
(2
YES
(5
case 1 0 V
XL100,
XL100A
fixed
NO
YES case 2 8.89 V
XL100B
optional
switch-off
YES configurable
case 1 0 V
XL100C YES
(1
NO YES
(5
(1
controller firmware ≥ 2.03;
(2
controller firmware ≥ 2.02;
(3
controller firmware ≥ 2.03 (local/shared mode), CARE ≥ 5.00.01 (open mode);
(4
CARE ≥ 5.00.01;
(5
controller firmware < 2.04;
(6
controller firmware < 2.04 (local/shared mode), CARE ≥ 5.01.xx (open mode);
(7
CARE ≥ 5.01.xx;
(8
Assigning "@" as first digit of input characteristic name (e.g.: "@0-10V") in the CARE text editor disables the pull-up resistor.
When using the XF821A/XFL821A for current inputs, be sure to assign "@" as the first digit of the input characteristic name.
A
D
18.2 k
(pull-up)
Ω
100 k
Ω
100 k
Ω
5 V
A
D
24.9 k
(pull-up)
Ω
150 k
Ω
49.9 k
Ω
10 V
A
D
24.9 k
(pull-up)
Ω
150 k
Ω
49.9 k
Ω
10 V
Case 1
Case 2 Case 3
Fig. 14. Input circuit diagram
Last Change
In the attribute "Last Change", the last change of state of a digital input/output is
stored with the time and date.