Hello, im hoping someone can help....

Ive got a Siemens Simatic FS420I (FSF7844-6MS50-0MT0) trans / rec lightguard and a
asi hand held programme unit 3RK1904-2AB01.

I plugged the programme unit in via the M12 connection on the unit and the bottom of the lightguard, tried to obtain the address via the ADDR setting and found the device shows 'dblAdd' and underneath flashes many many addresses. The lightguard has a solid red and green led (which according to the manual is comms error). Ive checked the hand held unit on other types of asi device and it works no problem. But on trying other lightguards it just gives the double address message.
Ive checked the batteries in the hand unit, tried a known working spare cable and the lightguard is totally off the network on a bench in the workshop?

Im hoping someone has come across this as its driving me mad and nobody so far has had any idea as to the problem.

Addressing the slaves

You can set the slave address in different ways:

● Offline with the addressing unit via the addressing socket or at the AS-i connection. Recommended when assigning addresses for the entire system. The direct connection between the slave and addressing unit ensures that the slave modules are not mixed up.

● Online by the AS-i master and in the PLC configuration software. Recommended for assigning addresses to individual slaves if an addressing unit is not available. Before assigning addresses, you must ensure that each address exists onlyonce in the AS-i network, that is, several new, additional modules (with address 0 in as-delivered condition) must not be connected to the AS-i cable.

From the Addressing and Diagnostics Tool for As-i Modules manual:
http://support.automation.siemens.com/WW/view/en/6004925

If two or more modules with the same slave address are detected at the AS-i bus, dbladd is displayed at the instrument. The corresponding address blinks in the address field.

Hope this helps,
Daniel Chartier