P3: Basic PLC Program for SINUMERIK 840D sl
13.8 Structure and functions of the basic program
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
903
Switchover of Bus address
An existing connection with a machine control panel (MCPl) or handheld unit (HHU) can be aborted. Another
MCP or HHU component already connected to the bus (different address) can then be activated. Proceed as
follows to switch addresses:
1. Stop communication with component to be decoupled via parameter MCP1Stop or MCP2Stop or BHGStop =
1.
2. Following checkback in DB10 byte 104 (relevant bits 0, 1 and 2 are set to 0), the bus address (with MCP, this
is the FB1 parameter "MCP1BusAdr" or "MCP2BusAdr") is changed; With HHU Ethernet variant, the bus
address is set at FB1 parameter "BHGRecGDNo") of this unit is changed to the new component.
3. In this PLC cycle, communication with the new component can now be activated again by means of
parameter MCP1Stop or MCP2Stop or BHGStop = 0.
4. Communication with the new component is taking place when the checkback is in DB 10 byte 104 (relevant
bits 0, 1, 2 are set to 1).
Switching off the MCP IE flashing
General behavior and general conditions
After POWER ON the MCPs always flash and indicate the completion of the power-up sequence and that the
system is waiting for a connection to be established (default setting of the MCP).
When establishing a connection to the MCP (e.g. the PLC connects itself to the appropriate MCP) the behavior of
the LEDs can be set for the subsequent state where there is no communication.
Presently, this behavior cannot be retentively stored on the MCP!
Setting via the PLC:
With MCP firmware V02.02.04 and higher, flashing can be suppressed in the offline mode.
No communication takes place in the offline mode (e.g. even if the MCP connection fails).
In order to deactivate the flashing, the bits in FB1 parameter MCPxStatSend (status double word for sending)
must be set as follows before communication to the MCP starts:
Bit 30 = FALSE and bit 31 = TRUE
Before communication starts to the MCP means:
• In OB100, or
• In OB1 before MCP stop/-start
(DB7 parameter change MCPxStop = TRUE → MCPxStop = FALSE)
Feedback of the status is presently not available.
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