Safety technology: MCB14x Document No.:
MG34Y104
Rev.: 06 23 October 2012 Page 17 of 25
6.4. MCB14x status readouts
7-segment multi-function display
The readout content depends on the operation status.
In order to reduce the converted power loss, the readout segments are destaged in normal mode after being shown
for 2 minutes, with the exception of initiator inputs. This can be enabled once again by briefly pressing any key.
Readout during initialisation
After switching on the operating voltage, the name of the module followed by the software version are displayed for
1s as follows:
MCB140:
MCB141:
c b 1 4 0
E d
0 1
Figure 8: Temporary readouts during initialisation
Readout in normal operation
A light segment is assigned to the input channels, internal safety circuit states and safety outputs in the 5-digit 7-
segment display as follows:
SS1_2
SS1_1
SKR-SS1
SLS_1
SKR-SLS
SLS_2 Door_1
SKR-Door
Door_2
Pr_1
Pr_2
Ramp
STO_O
ExC
SSO
Figure 9: Assignment of status readouts
The way in which input states are shown depends on the respective input configuration. It is not the terminal level
that is shown, but rather it is generally the internal logic state instead:
Parameterised contact
position
Terminal state
Terminal
operation
Input and segment state
NC
24 V DC
Not enabled
On
Open
Enabled
Off
NO
24 V DC
Enabled
Off
Open
Not enabled
On
Table 16: Assignment of input terminal states - Input channel states
The respective input channel states form the basis for calculating the safety circuit states:
Input channel_1
Input channel_2
Safety circuit state/readout
On
On
Enabled
Off
On
Not enabled
On
Off
Off
Off
Table 17: Assignment of input channel states – Safety circuit states
The safety circuits only change to an enabled state if both of the associated input channels change to an enabled
state at the same time.
If inputs are disabled in a user configuration, then status readouts shall remain permanently switched on on their
assigned safety circuit.
c b 1 4 1
E d
0 1
