Mitsubishi Electric MELSEC iQ-R Series Safety Function Block Reference page 32

FB details
This FB supports the function that enables manual operations by selecting the operating mode (i_bS_SafetyActive is set to
ON) and using enable switches with three positions. The operating mode must be selected outside this FB. The status of
enable switch contacts (The contact E1+E2 must be connected to i_bS_EnableSwCh1. The contact E3+E4 must be
connected to i_bS_EnableSwCh2.) is monitored and position change and the current position of enable switches are
detected. The manual operation can be enabled by this FB whose o_bS_EnableSw_Out is set to ON, after a move from
position 1 to position 2. With other switching directions or positions, the manual operation is not enabled when
o_bS_EnableSw_Out is OFF.
Status of enable switch contacts Position 1 (Not pressed)
Contacts E1+E2 status
Contacts E3+E4 status
When returning from position 3 to position 1, the enabling function is not activated. The status of the contacts E1+E2 set to
ON and contacts E3+E4 set to OFF does not exist as a contact status for the enable switch with three positions. If the status
is detected, the status refers to position 3.
WARNING
In order to meet the requirements of IEC 60204 Section 9.2.4, the user shall use a suitable switching device. In addition, the user must ensure that the relevant
operating mode (IEC 60204 Section 9.2.3) is selected in the application. (Automatic operation must be disabled in this operating mode using appropriate
measures).
4 SAFETY FB SPECIFICATIONS
30
4.4 M+SF_ENBLSW_R
OFF
ON
Position 2 (Mid position)
ON
ON
Position 3 (Past mid position)
OFF
OFF