Automation device

Abstract

An automation device includes a master module, and a slave unit having a slave modules, where an interface module (IM) of the slave modules of the slave unit is connected to the master module via a bus, where each of the modules is parameterizable using a message transmitted to the IM by the master module, the message includes a data area for each of the slave modules for parameterization of each of the slave modules, and the message includes a data area for each slave module for its parameterization, wherein at least one default parameter data record is stored in at least one of the slave modules, and wherein a data record index, which is stored in that data area of the message which is provided for the at least one slave module is provided for accessing the at least one default parameter data record.

Claims

1. An automation device comprising: a programmable logic controller having a CPU module and a master module; a slave unit having a plurality of slave modules, an interface Module (IM) of the plurality of slave modules of the slave unit being connected to the master module of the programmable logic controller via a bus, each of the plurality of slave modules being parameterizable using a message transmitted to the IM by the master module of the programmable logic controller, the message having a data area for each of the plurality of slave modules for parameterization of each of the plurality of slave modules; wherein at least one default parameter data record is stored in at least one slave module of plurality of slave modules; wherein a data record index, which is stored in the data area of the message which is provided for the at least one slave module is provided for accessing the at least one default parameter data record; and wherein the IM identifies from the data record index whether the message is a parameter message and identifies from slot addresses of the plurality of slave modules which of the plurality of slave modules require access with respect to their parameterization.

2. The automation device as claimed in claim 1, wherein envisaged changes of parameters in the at least one default parameter data record are also stored in the data area of the message which is provided for the at least one slave module.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention, its refinements and advantages are explained in more detail below using the drawing which illustrates an exemplary embodiment of the invention and in which, in which:

(2) FIGS. 1 and 3 show a slave module; and

(3) FIGS. 2, 4 and 5 show an automation device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) The same parts illustrated in FIGS. 1 to 5 are provided with the same reference symbols.

(5) With initial reference to FIG. 5, which illustrates a conventional automation device 1, parts of this automation device 1 for controlling a technical process are a programmable logic controller 2 having a CPU module 3, a master module 4 and three slave units 5, 6, 7. The slave units 5, 6, 7 each have an interface module 5a, 6a, 7a which is used by the master module 4 to have read and/or write access to the slave modules of the slave units 5, 6, 7. It should be understood that the programmable logic controller 2 has further modules, such as a plurality of analog and/or digital input/output modules, communication modules and other modules suitable for operating the programmable logic controller 2 and for controlling the process. In addition, it should be understood that the CPU module 3 itself may be designed to undertake the tasks of the master module 4.

(6) In the present exemplary embodiment, only slave modules 5b, 5c, 5d of the slave unit 5 are illustrated for the sake of clarity. In order to parameterize these modules, the master module 4 transmits a parameter message Pr1 to the interface module 5a of this slave unit 5 via a bus 8, such as a PROFIBUS DP. This message Pr1 comprises a data record number that indicates to the slave units 5, 6, 7 that the message Pr1 is a parameter message. The message Pr1 also comprises an address for addressing the slave unit 5 and data areas Bb, Bc, Bd assigned to the slave modules 5b, 5c, 5d. These data areas Bb, Bc, Bd are each provided with a slot number or slot address for addressing the respective slave module 5b, 5c, 5d and also have parameters for parameterizing the respective slave module 5b, 5c, 5d. In the example shown, the size of the data areas Bb, Bc in the message Pr1 is 8 bytes in each case and, in contrast, the size of the data area Bd is 150 bytes, which indicates that, for the slave module 5d, considerably more parameters are needed to parameterize this slave module 5d in comparison with the slave modules 5b, 5c.

(7) On account of the fact that only 79 bytes (area Bx1) of the maximum length of 244 bytes can be occupied in the message Pr1, a further slave module can be plugged into a free slot 9 of the slave unit 5 only if the data (i.e., slot address, parameters) for this slave module do not exceed these 79 bytes.

(8) In order to make it possible for a further slave module, for which more than 79 bytes of data are required, to also be able to be inserted into the free slot 9 in the slave unit 5 in this case, slave modules are provided and are configured such that a default parameter data record is stored in a memory of such slave modules and can be accessed using a data record index. This index is stored in that data area of the message which is provided for this slave module, which message is transmitted by the master module to the interface module of the respective slave unit. Such slave modules, for which a multiplicity of parameters are needed for their parameterization, are preferably configured as described.

(9) FIG. 1 shows such a slave module 5e having a memory 10 that stores a default parameter data record 11 having parameters, this data record having a size or length of 150 bytes. Based on a data record index 13 supplied to a controller 12 of the slave module 5e, the default parameter data record 11 is loaded into a parameter memory 14 of the controller 12, as a result of which the slave module 5e is parameterized. As described, the data record index is part of a parameter message which is transmitted by the master module to a slave unit.

(10) For the purpose of a more detailed explanation, reference is made to FIG. 2 which, for greater clarity, illustrates the automation device 1 described in FIG. 5 without the slave units 6, 7. Instead of being equipped with the slave module 5d (see FIG. 5), the slave unit 5 is equipped with the slave module 5e, where the master module 4 supplies a parameter message Pr2 to the slave unit 5 to parameterize the slave modules 5b, 5c, 5e. In contrast to the parameter message Pr1 (see FIG. 5), this parameter message Pr2 has, instead of the data area Bd, a data area Be with a length of 2 bytes, in which only the data record index 13 and a slot number 15 or slot address are stored. In the present exemplary embodiment, the numbers 2, 3, 4 are allocated to the slave modules 5b, 5c, 5e as slot numbers 15. As described, the interface module 5a uses this slot number 15 to address the slave module 5e, and the data record index 13 is used to indicate to the slave module 5e that the default parameter data record 11 comprising 150 bytes should be transmitted from the memory 10 to the parameter memory 14. As a result of the fact that the size of the area Be is only 2 bytes, 227 bytes can be used as a free area Bx2 in the message Pr2 for the purpose of parameterizing further slave modules.

(11) It should be understood that the slave modules 5b, 5c can be configured in a manner corresponding to the slave module 5e, only 2 bytes1 byte for a slot number and 1 byte for a data record indexlikewise being required in this case for the areas Bb, Bc in the message, and the slave modules 5b, 5c each also having a default parameter data record having a length or size of 8 bytes.

(12) The situation may occur in which a slave module can be configured in various ways depending on the operating mode and functionality. In order to be able to set different configurations using the parameters, the slave module in this case has a plurality of default parameter data records which are again referenced using a data record index. In the present exemplary embodiment, five default parameter data records D1 to D5 of the same data structure or the same format are provided for a slave module 5f (see FIG. 3) and are stored in a memory 16 of the slave module 5f. Each of these default parameter data records D1 to D5 each comprising 150 bytes is again accessed using the data record index 13. The data record index 13, for example an index 3, causes the controller 12 to enter the default parameter data record D3 in the parameter memory 14.

(13) The situation may also occur in which some parameters stored in a default parameter data record must frequently be changed, but the intention is to dispense with storing a multiplicity of default parameter data records for the different parameter configurations or settings in a slave module. In order to restrict the number of default parameter data records stored in this slave module, provision is therefore made for parameters which need to be frequently changed to be able to be accessed in a default parameter data record and to be easily changed.

(14) It is assumed below that parameters that need to be frequently changed are stored in bytes 1 to 9 in the default parameter data record D3 (see FIG. 3). These 9 bytes are accessed by reserving a further 9 bytes 1 to 9, in which the new parameters are stored (see FIG. 4), in an area Bf assigned to the slave module 5f in a parameter message Pr3. Here, the interface module 5a uses the slot number 15 to address the slave module 5f and uses the data record index 13 to address the default parameter data record D3, based on which this default parameter data record D3 is loaded into the parameter memory 14, in which case, on account of the new parameters stored in bytes 1 to 9, the parameters loaded into the parameter memory 14 are overwritten in the bytes which correspond or are assigned to these bytes 1 to 9, which is indicated in FIG. 3 via a reference symbol 17. As described, such measures reduce the number of default parameter data records to be stored in the memory 16 of the slave module 5f, but also reduce a free area Bx3 in the parameter message Pr3 because additional bytes 1 to 9 need to be reserved or specified in said message to make changes in the referenced default parameter data record D3.]

(15) Thus, while there have shown, described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.