DE19631894A1 - Bus subscriber's plug-in arrangement - Google Patents

Abstract

The arrangement of a programmable control is provided with socket outlets (1a,1b...1j) for the bus subscribers. It includes a central rack (2) and an extension rack (3). The socket outlets are connected together by a serial bus (4). The bus is connected with the corresponding bus lines in the rack (3) by a terminal unit (6) of the central rack (2), a cable (7) and the terminal unit (8) of the extension rack. The terminal units have coding switches for setting a rack address for the racks. The code goes to the parallel bus (5) and the coding contacts (9) of the sockets are intended for setting the socket codes on the potential lines.

Description

The invention relates to a bus participant in a multiple slots provided arrangement is pluggable, the Slots over a provided with at least one line serial bus connected together with one connector medium, which contacts for connection to the serial bus and has coding connections of the slot, which to generate a slot code on potential lines are closed, the contacts for connection to the Co dierungsanschluß are arranged so that the bus Line contacts of the serial bus between these be Find.

So that bus participants in a bus system via a serial Bus can communicate, it is first necessary to use this To provide bus subscribers with a subscriber address, under which a bus subscriber currently active has the white addressed to other participants. The address can e.g. B. manually by a user using suitable coding switches for the part or automatically by the bus participant himself can be set. An automatic setting can e.g. B. by causing slot encodings to be provided and the participant is plugged into a slot Reads slot code and from this its bus participants generated address, the slot code itself the part address can be. In this case, for a good shielding of the subscriber's bus line contacts be taken care of.

The present invention has for its object a with a connector for a serial bus participants with a simplified shielding of the buslei to specify contacts.  

This object is achieved by the measure specified in claim 1 took solved.

In one embodiment of the invention according to the features of The connections of the pots are also advantageous tial lines, which are used to generate slot codes can also be seen for shielding the bus line contacts of the serial bus.

In one embodiment of the invention according to the features of Claim 3 instructs the connection means contacts for connection a parallel bus of the arrangement on the address code tion of a group of slots is provided, one improved shielding of the serial bus line contacts is achieved by that these contacts together with the Co the bus line contacts.

The parallel bus is for coding a group of plug places provided, which makes it possible to have a system with addressable central and expansion racks Lichen, one rack each a group of slots includes. Each rack has a set code or addressable via an address assigned to this code, the Bus participants in a rack by the slot codes or by the bus participants generated from these slot codes addresses. The same slot codes can be used for each rack be provided. Each bus participant is on the rack address and slot code can be clearly identified.

In a further embodiment of the invention according to Merk paint the claim 4, the bus subscriber can automatically generate his subscriber address within a rack where reduced by the configuration effort for a user becomes.

Based on the drawing, in which an embodiment of the Er invention is illustrated, the following are the inventions  tion as well as additions and further training described and explained.

Show it

Fig. 1 is a schematic diagram of an arrangement places with plug,

Fig. 2 is a slot coding circuit,

Fig. 3 shows a contact arrangement of a slot connector and

Fig. 4 shows a further contact arrangement of a slot connection.

In Fig. 1 with 1 a, 1 b. . . 1 j with bus participants be assignable slots of a programmable logic controller, which includes a central rack 2 and an expansion rack 3 . The slots 1 a, 1 b. . . J 1 are connected to each other via a serial bus 4, wherein a connection unit 6 of the central rack 2, a connection cable 7 and a connector unit 8 of the extension racks 3 the serial bus 4 connected to the corresponding bus lines in the rack. 3 The connection units 6 , 8 are provided with coding switches (not shown), with each of which a rack address for the central rack and the expansion rack can be set, this code being fed to a parallel bus 5 . Coding connections 9 of the slots 1 a, 1 b. . . 1 j are connected to potential lines (not shown) for setting slot codes, 2 , 3 different slot codes being set within a rack, so that each slot can be clearly identified.

To clarify the slot code setting, reference is made to FIG. 2, in which a slot coding circuit is shown. Two potential lines P5V, M5V are via protective circuits R, C to the slots 1 a, 1 b. . . 1 j out and connected according to the desired coding to be set to the coding connections 9 of the respective slots. In the example, code 10100 is set at slot 1 a, code 01100 is assigned to slot 1 b.

So that one in the slots 1 a. . . 1 j pluggable bus participant, e.g. B. a communication module, can be addressed by another bus subscriber via the serial bus 4 , the bus subscriber, e.g. B. during an initialization phase, generate his bus subscriber address. Next to contacts for connection to the serial bus 4 , the connection means (not shown) of the bus subscriber has further contacts for making contact with the coding connections 9 of the corresponding slot. Furthermore, the bus subscriber is provided with means for reading in the potentials (of the slot code) at these coding connections 9 , from which these means generate the bus subscriber address of this subscriber. In the simplest case, this address to be generated consists of the slot code itself.

Fig. 3 shows a contact arrangement of a slot connection ses. It is assumed that in the present example the programmable logic controller comprises only one central rack and therefore no connection to the parallel bus 5 is required for addressing a rack. Connections KBP, KBN for connection to the serial bus are between slot coding connections SN0, SN1. . . SN4 arranged, whereby a good shielding of the connections KBP, KBN is achieved. An improved shielding is achieved in that the slot coding connections SN0, SN1. . . SN4 and potential connections P5V, M5V surround the connections KBP, KBN. Accordingly, the contacts of the connection means of the bus subscriber are arranged, which, in the event that the subscriber is plugged into the slot, is in operative connection with these slot connections.

Fig. 4 also shows the arrangement of connections of a slot, wherein it is assumed that a central and an expansion rack are provided and the serial bus is designed redundantly. Connections RN0, RN1, RN2, RN3, RN4 are therefore required to connect the bus subscriber to the parallel bus 5 . The rack codings set in the connection units 6 , 8 are guided through these connections by corresponding potentials (P5V, M5V). First and second bus connections KBP1, KBN1, KBP2, KBN2 of a first and a second serial bus are surrounded by potential connections P5V, M5V, slot coding connections SN0, SN1. . . SN4 and the rack coding connections RN0, RN1. . . RN4, where good shielding of the bus connections KBP1, KBN1, KBP2, KBN2 is achieved. Accordingly, the contacts of the connection means of the bus subscriber are also arranged here, which, in the event that the subscriber is plugged into the slot, is in operative connection with these connections. Furthermore, the connection means of the bus subscriber has contacts for connection to connections AN1, AN2, AN3, which are reserved for possible extensions. For example, in a practical exemplary embodiment of the invention, the connections AN1, AN2 are provided for setting a BAUD rate, which the bus subscriber indicates to an actively switched bus subscriber via these connections.

Claims (5)

1. Bus subscriber which can be plugged into an arrangement provided with a plurality of slots ( 1 a, 1 b,...), Whose slots ( 1 a, 1 b,...) Via a serial bus provided with at least one line ( 4 ) are connected to one another, with a connection means which has contacts for connection to the serial bus ( 4 ) and to coding connections ( 9 ; SN0, SN1... SN4) of the slot, which for generating a slot code on potential lines (P5V , M5V) are connected, the contacts for connection to the coding connections ( 9 ; SN0, SN1 ... SN4) being arranged such that the bus line contacts of the serial bus ( 4 ) are between them. 2. Bus device according to claim 1, characterized in that the contacts for connection to the potential lines (P5V, M5V) together with the contacts for connection to the coding connections ( 9 ; SN0, SN1 ... SN4), the bus line contacts of the serial Busses ( 4 ) surrounded. 3. Bus subscriber according to claim 1 or 2, characterized in that

• - That the connection means further comprises contacts for connection to a parallel bus ( 5 ) of the arrangement which is provided for address coding a group of slots ( 1 a... 1 e; 1 f... 1 j), and
• - That the contacts for connection to the parallel bus ( 5 ) together with the coding connections ( 9 ; SN0, SN1 ... SN4) and the potential line connections surround the bus line contacts te of the serial bus ( 4 ).

4. Bus subscriber according to one of claims 1 to 3, characterized characterized in that the bus subscriber with means for Reading the slot code via the contacts of the connection by means of and for generating the bus subscriber address from this Slot code is provided.   5. Arrangement with several bus participants according to one of the An sayings 1 to 4.