Synchronizing Multi Processor Systems with Minute Pulse-PM645 or PM665

Date: May 07, 2025 Views: 903

　　The configuration is shown in Figure 4-9. All Processor Modules receive the same minute pulses from an external clock. Pin 4 (external time sync) and Pin 6 (GND) of the I/O port are used

　　Connecting a DCF77 Clock to Com B

　　All Processor Module are capable to connect to a DCF77 clock via serial port Com B. The connection depends on the type of DCF77 clock being used. The following example shows the pinout for the “Hopf 7001 DCF” clock:

　　Chapter 5 Mechanical Design

　　Mechanically, Advant Controller 160 consists of subracks, cable ducts, modules and process connectors.

　　The mechanical design of the S600 and S800 I/O modules is described in detail in two separate Product Guides.

　　The subracks and cable duct are designed for wall mounting.

　　The 10-position controller subrack, RF616, is the primary subrack. It provides dedicated positions for Processor Module, Communication Interface and Bus Extender modules. There is a two-digit thumb wheel switch for setting the station address. The individual module address is given by its position in the subrack.

　　The bus connector links the controller subrack to an optional extension subrack via a bus cable (TK612). The 10-position extension subrack, RF620, extends the number of I/O modules of a station. The individual module address is given by its position in the subrack.

　　The cable duct, RC610, holds the process cables. It also provides ten screw terminals for connecting the cable shields of process cables to ground.

　　Figure 5-1 shows the physical layout and Figure 5-2 the dimensions of a fully equipped subrack with cable duct.

　　Advant Controller 160 can be delivered as separate subracks for mounting in any suitable cabinet, but it can also be delivered in standard RM5xx cabinets, please refer to Chapter 8.

　　Full information for mounting Advant Controller 160 in cabinets is given in the cabinets chapter of the Product Guide for Advant OCS with Master Software, Overview, or for details in the Advant Controller 160 User’s Guide.

　　Communication

　　Data Set elements hold references to DAT elements. Up to eight DAT elements can be connected to one Data Set.

　　A DAT element can hold one variable representing:

　　• 32 Booleans (32 bits) or 1 real number (32 bits) or

　　• 1 long integer number (32 bits) or 1 short integer number (16 bits).

　　The Data Set communication service cyclically transfers information from the DAT elements specified in the sending controller to the DAT elements specified in the receiving controller. The cycle time for each Data Set can be selected from the range 2 ms to 4 s.

　　The Data Set communication service is based on the broadcast principle, allowing any station to receive any Data Set sent on the bus. The advantage of broadcasting is that information only needs to be transmitted once regardless of the number of receiving stations. This principle is highly efficient when the same information is required in two or more stations, especially in time-critical applications.

　　The Data Set communication uses resources on Advant Fieldbus 100, in the Communication Interface modules and also in the Processor Module. The system data shown in Table 6-2 and Table 6-3 are valid both for the main control Advant Fieldbus 100 and the second (subordinate) control Advant Fieldbus 100.

　　To estimate the bus load for a given application, the following formula should be used.

　　Bus load in percent = ((N × Ttr) / Tc) × 100%, where:

　　N = the number of Data Sets (of the same size and Tc)

　　Ttr = the transfer time in ms (from the above table)

　　Tc = desired cycle time in ms (2, 4, 8, 16, …, 4096)

　　The resulting load must not exceed 75%, the remaining capacity must be reserved for background communication (e.g., remote programming).

　　Note that only the sending Data Sets are to be included in the calculation.

　　RCOM/RCOM+ Communication

　　An MVI channel may act as master or slave. In case of master operation it can have up to 25 slaves. Data between master and slave station is transferred using MVB elements (MVI data block) which is similar to Data Set elements. MVB elements hold references to DAT elements. 1 to 8 DAT elements can be connected to one MVB with RCOM. RCOM supports 1 to 8 DAT and RCOM+ supports 1 to 24 DAT’s.

　　The number of MVI data blocks that can be exchanged via the serial interface depends on the transmission speed and the specified cycle time. For performance estimation—including resulting CPU load—the figures for Advant Controller 110 within Advant OCS Product Guide as worst case figures can be used.

　　PROFIBUS-DP Communication

　　The PM644 is installed in the basic station of Advant Controller 160. It is equipped with one PROFIBUS-DP master interface which allows to use PROFIBUS I/O devices as distributed I/O. The setup of this link is defined by a number of database elements. The PROFIBUS link forms a local control network within the Advant system with the network numbers 1 to 9. Each I/O device may have a number from 0 to 125.

　　Event Transfer and Detection

　　Events can be detected with Digital Input modules DI650, DI651, DI652, DI685, DI885 or as calculated DI events. After the detection of an event in Advant Controller 160 the event can be transferred via RCOM/RCOM+ or Advant Fieldbus 100 to a Advant Controller 400 Series or to SattGraph 5000/AdvaSoft 2.0 for Windows NT Operator Station with OPC Server for further treatment. For each event queue (database element EVS(T) or EVS(S) in Advant Controller 160), up to 10 nodes on the Advant Fieldbus 100 network can be assigned to receive this event message.

　　The relative time errors between events detected in different Advant Controllers 160 within the same Advant Fieldbus 100 is < 10 ms. Relative time error within one controller is ≤ 1 ms. For more information about event transfer and detection, please refer to Table 6-7.

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