Operating Instructions KB2 Keyboards
Appendix C
Page 46 of 68
R. STAHL HMI Systems GmbH / OI_Keyboard_KB2_en_V_01_00_02.docx / 07.03.2022
18.1.2
Connections
Examination of the voltage, current, capacitance and inductance values of all circuits to establish
the connection between the KB2 keyboards and assemblies with a standard cable length of 2.4 m
and the SERIES 400 Open HMI - Panel PCs and SERIES 500 Remote HMI - Thin Client devices.
a) ET-/MT-xx7 HMI device with KB2 keyboards / assemblies
Source / active
==>
Sink / passive
ET-/MT-xx7
KB2 keyboards / assemblies
Terminals X11 / X12
Keyboard connection
Uo = 5.5 VDC
≤
Ui = 5.9 VDC
Io = 309 mA
≤
Ii = 319 mA
Po = 629 mW
≤
Pi = 650 mW
Co [µF] =
50
≥
Ci = 21 µF
Lo [µH] =
40
≥
Li = 1.68 µH
C
o
and L
o
pairs directly above / underneath each other may be used.
For the fixed cable, an additional capacity value of 200 pf/m and inductance value of
1 µH/m must also be taken into account !
b) ET-/MT-xx8 HMI device with KB2 keyboards / assemblies
Source / active
==>
Sink / passive
ET-/MT-xx8
KB2 keyboards / assemblies
Terminals X33 / X34
Keyboard connection
Uo = 5.36 VDC
≤
Ui = 5.9 VDC
Io = 249.85 mA
≤
Ii = 250 mA
Po = 518 mW
≤
Pi = 650 mW
Co [µF] =
46
32
25
21
≥
Ci = 21 µF
Lo [µH] =
1.68
2.68
3.68
4.68
≥
Li = 1.68 µH
C
o
and L
o
pairs directly above / underneath each other may be used.
For the fixed cable, an additional capacity value of 200 pf/m and inductance value of
1 µH/m must also be taken into account !
