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Reference PS69-DPS ♦ CompactLogix or MicroLogix Platform
User Manual Profibus DP Slave Communication Module
Page 74 of 108 ProSoft Technology, Inc.
May 9, 2014
Watchdog
Using the Watchdog functionality a network slave is able to monitor bus traffic in
order to ensure that the network master is still active and process data sent and
received are still being updated. The Watchdog time is configured in the master
config tool and is transmitted from the master to the slave during the network
start-up phase. If the Watchdog time out has been reached the slaves go to their
Fail Safe state (if supported) or set their outputs to "0".
5.3.2 DPV1 Services
As an addition to cyclic DPV0 services, non-cyclic services called Read, Write
and Alarm were added to PROFIBUS. These services are referred to as DPV1.
With DPV1, it is possible to address individual modules within the slave. In
addition, DPV1 services allow transferring non-time critical data to slaves who
require a large amount of configuration data or slaves that have to change
measurement ranges during runtime. DPV1 data exchange takes place after
cyclic data exchange in a PROFIBUS network cycle.
Read Request
With a Read Request telegram, the class 1 master can read data addressed by
slot and index within the data range of a slave device. This may take several
DPV0 cycles. If the master discovers a timeout, it aborts both DPV1 and DPV0
communication with the slave. Then the communication to the slave has to be re-
established. The master initiates the Read Request service.
Write Request
With a Write Request telegram, the class 1 master can write data addressed by
slot and index into the data range of a slave device. The timeout handling is
identical to the Read Request. The master initiates the Write Request service.
Alarm Indication
DPV1 Alarm handling is an addition to the Device Diagnostic function in
PROFIBUS. Alarms are reported to the master as device specific diagnostic
information. Therefore, the slave initiates an Alarm Indication. Other than Device
Diagnostic messages, Alarms have to be acknowledged by the Master.
5.3.3 Start/Stop Communication
Start/Stop communication with one bit: With the "NRDY" (NotReady) Bit the user
program can start or stop communication with the PROFIBUS-DP system. When
this Bit is set from the user program, the communication between the slave and
the master is stopped and will activate diagnostic request which is reported to the
PROFIBUS master during runtime. The cyclic data exchange will be suspended
and the module switches into a diagnostic mode and reports static diagnosis to
the master. This control bit allows the user program to make a controlled start of
the communication with the PROFIBUS system.
- PS69-DPS 1
- Your Feedback Please 2
- How to Contact Us 2
- ProSoft Technology 2
- Product Documentation 2
- Contents 3
- 1 Start Here 9
- 1.1 Software Requirements 10
- 1.2 Hardware Requirements 10
- 1.3 Reference Systems 10
- 1.5 Package Contents 12
- 1.8.2 Create the Module 18
- ESSAGE CONFIGURATION TAG 23
- EW MODULE 25
- MPORT RUNG… 27
- OMMUNICATIONS 32
- 2.1 RSLogix 5000 38
- 2.1.1 Module Selection 38
- 2.1.2 Module Properties 1 40
- 2.1.3 Module Properties 2 41
- 2.2 RSLogix 500 42
- 2.2.1 Module Selection 42
- 2.3 Slave Configuration 45
- 2.3.1 General 45
- 2.3.2 GSD File 45
- 3 RSLogix Example Program 49
- 4.1.1 CompactLogix 56
- 4.1.2 MicroLogix 1500 56
- 4.1.3 PS69 LEDs 57
- 4.2 Troubleshooting 58
- 4.2.1 CompactLogix I/O LED 58
- 4.2.2 MicroLogix Fault LED 58
- 4.2.5 Cable 60
- 5 Reference 61
- 5.1 Specifications 62
- 5.1.4 PROFIBUS Interface 65
- 5.2.7 APP_CONSTANT_PATTERN 68
- 5.2.8 APP_DPV1_PROG_CONTROL 68
- 5.2.9 APP_DPV1_STAT_COUNTER 68
- 5.3 PROFIBUS Functionality 73
- 5.3.1 DPV0 Services 73
- 5.3.2 DPV1 Services 74
- 5.4 Communication 75
- 5.4.2 CIP Messaging 84
- In This Chapter 103
- Contacting Technical Support 103
- 6.1 Warranty Information 105
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