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3 Using the ML71 measuring system

When using the ML71 measuring system from Hottinger Baldwin Messtechnik GmbH, an

implementation exists for recording measuring values via a CAN interface. Measuring values are

handled using the resource interface of the APCI-8001 / APCI-8008.

The measuring values are transferred to the APCI-8001 / APCI-8008 via the CAN bus. When using

CAN-Bus 1 of the ML71, the measuring values can be processed individually or line by line

(resource # 10000) or, in conjunction with the scanner functionality, block by block (resource #

10013).

When using CAN-Bus 2 of the ML71, only line-by-line processing can be carried out, since the

measuring values are not acknowledged via a sync signal here.

3.1 Version notes

The RWMOS.ELF operating system software must include the options "optionMSM9255"

(CAN support), "optionRESOURCE" and "optionML71" in order to use the function of the ML71

module. This version is only available from V2.5.3.72.

3.2 Initialising the CAN module for ML71

The information in Section 2 sometimes applies here. However, the ML71 measuring system does not

support the CANopen protocol. Thus, only the following operations are necessary and permitted for

the initialisation and commissioning of the CAN bus.

•

Run CanBus Clean at program start so that any existing access objects are deleted.

•

Request CanBusOpen; if not "true", then assign 1 to each of the variables "CanBusOpen",

"CanBusInit" and "CanBusStart"

•

Enable the CanBus function in RWMOS by calling the "CanBusEnable" function with the

parameter 1; only then are accesses via the CanBus possible

•

Read the measuring values using resource # 10000 or using resource numbers 10000 or

10013 in the scanner module (see Table 4).

NTERFACE