Extended Profibus Dpv1 Functionality; Acyclic Read Operation (Modbus Functions 03H And 04H) - GE Multilin MM200 Communications Manual

CHAPTER 3: FIELDBUS INTERFACE

Extended Profibus DPV1 functionality

Acyclic Read
Operation (Modbus
functions 03H and
04H)
MM200 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Category Object Slot
Last Trip Data 0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
Contact Inputs 0 0
Contact 0 0
Outputs
Table 3-8: DPV1 acyclic write data
Object Slot
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
MM200 supports DP-V1 extended functionality (acyclic operations), which allows access to
any memory mapped address, including:
• Actual Value reading
• Parameter reading
• Parameter writing
• Execute command
These operations can be started by a Profibus Master Class I or Class II using specific
operations based on the DP-V1 slot and Index message parameters.
The maximum message size that can be exchanged through DPV1 is limited to 244 bytes
(122 words).
The MM200 memory is mapped in 16 bits variables, thus, only communication data
exchange with even data quantities is accepted.
The security functionality implemented on MM200 is strictly applicable. Parameter write
access is controlled by passwords as defined in Security Section of the MM200 Instruction
Manual.
Profibus DPV1 acyclic read operations can be executed against the complete memory
map, as defined for Modbus communication. Due to the high number of variables and
parameters that can be reached and the Profibus DPV1 limited address format, this
access must be executed in the following way:
1. Define the memory address based on the Modbus Memory Map (0 based addressing)
Index Length Data Item
(in Bytes)
62 2 Cause of Last Trip
64 2 Pre Trip Ia
68 4 Pre Trip Ib
72 4 Pre Trip Ic
76 2 Pre Trip Motor Load
78 2 Pre Trip Current Unbalance
80 4 Pre Trip Igrd
84 2 Reserved
88 4 Contact Input 32-1 (Bit Field)
92 4 Contact Output 32-1 (Bit Field)
Index Bit Number
0 0 to 7
0 8
0 9
0 10
0 11
0 12
0 13
0 14
0 15
PROFIBUS DPV1
Bit Mask Description
Reserved Byte
1 Reset
2 Lockout Reset
4 Stop
8 Start A
10 Start B
Reserved Bit
Reserved Bit
Reserved Bit
Format
FC134
F10
F10
F10
F1
F1
F10
FC167
FC167
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