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Question/Fault Cause/Remedy

Commuwin II cannot open the connection to the PROFIBUS PA devices.

Commuwin II is a Class 2 master that allows the transmission of acyclic values.

The PROFIBUS-DP baudrate to be set depends upon the segment coupler used.

The connection to the devices cannot be opened.

• If the PLC and Commuwin II are used in parallel, the bus parameters must be mutually compatible. The bus parameters must be identical for all connected masters.

– If Commuwin II is used, the Token Rotation Time (TTR) calculated by the PLC configuration tool must be increased by 20 000 bit times and the cor-responding value entered in the Commuwin II DDE server

– In the case of a Siemens S5 system with ComProfibus, the Delta TTR must be increased by 20 000 bit times.

• The HSA parameter (Highest Station Address) must permit the

Commuwin II address. The HSA specifies the highest address permitted for active participants (masters) on the bus. Slaves can have a higher address.

• Is the Commuwin II address free or is it being used by another device?

• Is the correct baudrate set?

• Have the drivers and cards been correctly installed? Is the green LED on the TAP of the Proficard or Profiboard lit?

• Is the GAP update to high (the result is longer waiting times)?

A device does not appear in the live list.

• Device is not connected to segment.

• Address used twice.

Device cannot be fully operated. • The device version is not supported by Commuwin II. A full device description is necessary. The default parameters of the PROFIBUS-PA profile are offered.

• Full operation is possible for Endress+Hauser devices and Samson positioners only.

A change of unit at the device has no effect on the value on the bus.

If the measured value at the device display is to be the same as that transmitted to the PLC, the parameters PV_SCALE and OUT_SCALE must be matched.

- OUT_SCALE_MIN = PV_SCALE_MIN - OUT_SCALE_MAX = PV_SCALE_MAX See the device operating instructions.

10 Technical Data

10.1 PROFIBUS DP

Identification

Function and system design

Electrical connection

Human interface

Standards

Designation PROFIBUS DP

Application Fieldbus for factory automation and process control

Bus access method Multimaster with logical token ring and master-slave

Topology See Chapter 2.2

No of participants Max. 126 per Bus, but max. 32 per segment Segments can be connected together with repeaters

Baudrate up to 12 Mbit, dependent upon transmission medium and cable length

Data transmission Digital, differential signals according RS 485, NRZ

Data storage HD=4, Parity-Bit, Start- and End-Delimiter

Response time Dependent upon the data transmission rate

Bus cable Copper: screened, twisted pairs, screening grounded at both ends.

Cable specifications, see Chapter 3.2 Fibre optics: see PROFIBUS DP specifications

Topology Line topology

Cable length Copper: up to 1200 m, depending upon baudrate, see Chapter 2.2

Spur length Total length of all spurs max. 6.6 m, for baudrates > 1.5 Mbit/s none

Bus connection Connecting elements: 9-pole Sub-D connectors with RS 485 or T-Box

Bus termination At both ends of every segment

Repeater Max. 9 Repeater

Local operation If appropriate, via keys or touch keys

PC operation Via operating program, e.g. FieldCare or Commuwin II

and PROFIBUS interface card (if supported by PROFIBUS PA profile)

Bus address Set with DIP switch, local operating elements or software Software/hardware addressing selectable

PROFIBUS DP IEC 61158 and IEC 61784

PNO Guidelines for PROFIBUS DP

Intrinsic safety possible: RS 485-IS with EEx ib

Physical layer RS 485

10.2 PROFIBUS PA

Identification

Function and system design

Electrical connection

Human interface

Standards

Designation PROFIBUS PA (Process Automation)

Application Intrinsically safe fieldbs for process engineering

Bus access method Multimaster with logical token ring and master-slave

Topology See Chapter 3

No. of participants max. 32 for non-hazardous applications max. 20 for EEX ib IIB

max. 10 for EEX ia/ib IIC

The actual number is dependent upon the the segment coupler and the current consumption of the participants

Baudrate 31.25 kBits/s

Data transmission Digital, bit synchron, Manchester II coding

Data storage Präambel, fehlergesicherte Start-End-Delimiter, CRP

Update time Dependent upon the number of devices on the bus:

t = n x 10 ms + PLC program run time + DP transmission time

Bus power supply, typical values EEx ia/ib IIC: 13,5 V, 128 mA EEx ia/ib IIB: 13,5 V, 280 mA Nicht-Ex: 24 V, 400 mA see Chapter 3.2

Bus cable Preferred: screened, twisted pairs, screening ground at both sides Cable specifications (and other types), see Chapter 3.3

Topology Line- and tree topology, combination possible.

For hazardous applications only line topology possible.

Cable length Dependent upon application and bus coupler, see Chapter 3.3

Spur length Max. 30 m each for hazardous applications, otherwise as in Chapter 3.3

Bus connection Connection elements: T-pieces, junction boxes

Bus termination At both ends

Specifications: R = 100 W ± 2 %, C = 1 mF ± 20 %

Repeater Max. 4 per bus segment

Local operation If appropriate, via keys or touch-keys

PLC operation Via common parameters and profile commands

PC operation Via operating program, e.g. FieldCare or Commuwin II and PROFIBUS interface card

Bus address Set with DIP switch, local operating elements or software Software/hardware addressing selectable

PROFIBUS PA IEC 61158 and IEC 61784

PNO Guidelines for PROFIBUS PA

Intrinsic safety EN 50 020, FISCO-model, IEC 79-14

Physical layer IEC 61158-2 (MBP)

11 PROFIBUS Components