CONTROL FUNCTIONS (CONT’D) General (Cont’d) [Figure 10-40-10] illustrates the voltage levels at the input terminal for the low-side contact input. When the switch turns on, the input terminal goes low for the switch with NO contact and goes high for the switch with NC contact. Figure 10-40-10
ECU
ECU VB
VB
1.2k
1.2k
Contact input
Contact input Source 10mA
SW=OFF(open)
Source 10mA
SW=ON(close)
SW=OFF(close)
Voltage=High
Voltage=High
Voltage=Low
Voltage=Low ECU logic=0
ECU logic=1
ECU logic=0
(a)Normally Open SW input
SW=ON(open)
ECU logic=1
(b)Normally Close SW input
Unless otherwise specified, this manual assumes that switches with NO contact are used. This means that turning on the switch activates the corresponding function. Selection of NO switch or NC switch is allowed by using mapping plug-ins. [See "Terminal assignment" on page 10-4051] for a list of contact input terminals for which a NO or NC switch can be selected.
10-40-9 57 of 182
E55W, E60, E80 Electronic Control System Manual
