Communication Protocols
Copyright IXXAT Automation GmbH
120
IEM Manual, 1.5
COM_k_ECT_COM_OBJ_ADD
Add a single object to communication profile area (0x1000
– 0x1FFF).
User is responsible for compatibility with specification. Parameter area
contains description in
COM_t_ECT_COM_OBJ
layout.
COM_k_ECT_RXPDO_INIT
Configure a safe output value used for RxPDO object. Default setting is
0 for all objects. Parameter area contains the safe output data.
COM_k_ECT_NAME_SET
Change the default description of an object. Description is not stored in
non-volatile memory. Parameter area contains a visible string without
termination.
5.3.14 Bus cycle time
The minimum EtherCAT bus cycle time supported by the IEM is 125µs. Con-
figuring a bus cycle faster than 125 µs will result in an error.
5.3.15 Operating system load (minor fault)
Even if the bus cycle time is slower than 125 µs, the operating system (OS) on
the module can reach the performance limit e.g. if the process data size is too
large. The OS is signaling a load limit using a specific info message.
5.3.16 Parameter service
Parameter services are used to access local, delayed or remote parameters.
Access to parameters are not time critical. In case of a delayed or remote SDO
connection they may also be quite time consuming. The parameter service
functions are therefore non-blocking functions with asynchronous response
mechanism and watchdog timer.
5.3.16.1 Open a remote SDO connection
For SDO transfer to a remote device the mailbox messages are routed by the
master. Success or failure accessing a remote device will be signaled by
events.
5.3.16.2 Close a remote SDO connection
When closing a previously opened channel the function will be answered im-
mediately because no direct communication channel is established while
opening.