Startup behaviour
The channels automatically change between the startup_primary and startup_waiting
states until the master starts the communication with the actuator. In the
startup_primary state, the actuator waits with the primary slave address for the master
to start the communication. The cycle starts with 2 s, this time is doubled after each
cycle to max. 32 s.
Change over
The actuator does not decide autonomously on change-over. The master detects a
loss of communication of the primary channel and may initiate change-over using a
parameter telegram (parameter command PrmCmd). The former backup channel
becomes the new primary channel.
Parameter command
Apart from the change-over commands, different parameters for the configuration
of the Profibus DP-V2 redundancy are transmitted using the PrmCmd parameter
command.
For Profibus DP-V2, the parameter command is part of the parameter telegram which
is sent to the actuator on startup of the communication.
Table 33: Structure of the PrmCmd parameter command
Remark
Bit
Byte
0
1
2
3
4
5
6
7
Block length (= 0x08)
0
0
0
1
0
0
0
0
1
Structure type (= 0x02,
PrmCmd parameter com-
mand for DP-V2 redund-
ancy
0
1
0
0
0
0
0
0
2
Slot
0
0
0
0
0
0
0
0
3
Specifier
Reserved
Sequence number
4
Function
Res
Primary Re-
quest
Stop
MSAC1S
Start
MSAC1S
Check Prop-
erties
Res
Master State
Clear
Res
5
Properties
Primary
Req_MS0_MS1
used
Start/ Stop
MSAC1S
used
Address
Change
Address Off-
set64
Reserved
6
Output Hold Time high
7
Output Hold Time low
8
Output Hold Time
In the event of change-over, the outputs will not be changed during this time (time
base = 10 ms)
Address Offset64/ Ad-
ress Change
Change-over between flying redundancy and system redundancy
AddressOffset64 = 1 and AddressChange = 1, > Flying redundancy is selected
AddressOffset64 = 0 and AddressChange = 1, > System redundancy is selected
Extended diagnostic
For activated Profibus DP-V2 redundancy, the primary channel of the actuator sends
a high priority response telegram; after that, the master reads the extended diagnostic
data Red_Status (Status_Type = 0x9F) with the new states.
When transmitting the PrmCmd parameter command via the master, the actuator
responds with Prm_Cmd_Ack (Status_Type = 0x9E).
With Red_Status/ Prm_Cmd_Ack, the actuator signals both the status of the primary
and of the backup channel.
47
Actuator controls
AC(V) 01.2/AC(V)ExC 01.2 Profibus DP
Description of the data interface
Содержание AC(V) 01.2
Страница 1: ...Actuator controls AC V 01 2 AC V ExC 01 2 Profibus DP Device integration Manual...
Страница 22: ...22 Actuator controls Description of the data interface AC V 01 2 AC V ExC 01 2 Profibus DP...
Страница 89: ...89 Actuator controls AC V 01 2 AC V ExC 01 2 Profibus DP...
Страница 90: ...90 Actuator controls AC V 01 2 AC V ExC 01 2 Profibus DP...