The label of the supply voltage pins 1L/2L and 3N/4N are inverted. This wrong label is present on the schema of the housing and directly on the pins.

Problem
When a PCD7.T162 produced before week 22 of 2011 (30.05.2011) has a 24V DC supply voltage it does not work when it is connected like described in the schema on the housing.

Solution
The pins 1L/2L and 3N/4N are printed inversely. This means that the functionality is still the same but the 24V DC need to be connected to the pins 3N/4N and the 0V to 1L/2L.



Remark
Units of PCD7.T162 produced after 11/22 (30.05.2011) are correctly labelled and they can be connected to the supply voltage as described in the schema on the housing.

There are confusing screw terminal identifier terminologies around. Depending on the manufacturer the identifiers used are in conflict to the identifiers you can find in SBC manuals.

General
RS-485 is a Bus-system, therefore the signal wires shall not be crossed.

Sometimes "+Data" and "-Data" can be found on devices. Then "+Data" propably has to be connected to "/Rx-/Tx" (or /D) and "-Data" to "Rx-Tx" (or D).

Converters
Some products form other manufacturers (p.e. RS232 - RS485 converters) are often inversly indicated. Therefore it is sometimes necessary to cross the wires.

Profibus and Profi-S-I/O 

Example for the port 3 of the PCD3.M5540 as Serial-S-Bus
RS485 connection (Serial-S-Bus) between PCD3.M5540 port 3 (S-Net D-Sub used as RS485 Serial-S-Bus) and PCD2.M5540 port 2 (connector block X3):

This converter is not suitable for application where its RTS signal is driven by a PC (PG5 and Visualisation system). The different RTS-handling with Win XP / Vista cause problems. A stable connection can't be garanteed.

You find on the market intelligent RS 232 - RS 485 converter appropriated for PG5 and supervision. For swiss customer the following adapter is avalable from Distrelec: I-7520A Manufacturer: ICP-DAS

www.distrelec.ch

www.distrelec.ch

www.icpdas.com/products/Remote_IO/i-7000/i-7520a.htm