Siemens SIMATIC MV500 Operating Instructions Manual page 147

WBM login when accessing via an automation system (DISA active)
If the optical reader is controlled via an automation system, i.e. with the DISA bit set, you will
need to log on to the optical reader as follows:
1. Make sure that only one PC is accessing the optical reader (padlock with red/gray marking).
2. Place the mouse pointer on the user currently logged on (top right) and click.
This brings you to the "Settings > Security" page.
3. To control the reader, log on as "User1" or "Service" user. This is only possible if the "Take
control" check box is selected for the relevant user.
Note that the automation system can only control the device to a limited extent when you
take over control with "Take control". Functions that require the DISA bit, such as "Program
change" and "Save program", can no longer be executed by the automation system in this
case.
Function of the DISA bit
By setting the DISA bit, you ensure that the connected automation system is in control of the
optical reader. When the DISA bit is set, users have only limited access to the reader via the
WBM. Only users that have been assigned a role with the "Take control" right are able to take
over control of the optical reader from the automation system.
Note that the DISA bit must be set so that the automation system can execute the functions
"Program change" and "Save program". As soon as a user with the "Take control" right
accesses the optical reader, control of the device by the automation system is limited and it
can no longer execute these functions.
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
Operator control and monitoring
147