Button IRT Config

This menu is enabled only for an IRT-capable controller (at present only EL6632). A global setting can be made for all projected devices via this menu.

On the one hand the type of communication can be specified here. At present only RTClass1 (RT) and RTClass3 (IRT Top) are supported.

In addition there is an option in this dialogue to specify a general cable length (for IRT only). An approximate value or the max. cable length is sufficient here, because for the calculation of IRT communication this value tends to be lower (at 100 Mbaud and copper cable 5 ns/m). For optimization this feature can also be deactivated again later and the exact cable length can then be entered for each individual device (on the port submodules).

Furthermore there is an option here to activate an ‘automatic port assignment’. As a result of this the port connection set in the TwinCAT project is irrelevant. Before each restart of the PN communication the topology is read out and the IRT communication is calculated on the basis of this. The advantage of this is that possible cabling errors are minimized. In addition to that the ports can be simply replugged without having to change and reload the TwinCAT project. Only a restart of the PN communication is required (e.g. switch terminal to PREOP or disconnect the cable). As a result of this the bootup of the PROFINET communication can take up to 30 seconds longer. The reason for this is the TTL (TimeToLive) factor in the LLDP MIB. These are set by default to 20 seconds, i.e. only after this time can it be guaranteed that the port connection read is also the current one.

Also, an additional offset for all Ti / To values can be specified in this menu.