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5
PROFIBUS-DP Operating Characteristics
Parameter setting via PROFIBUS-DP
54
Manual – MOVI-PLC
®
basic DHP11B.. controller
The following table shows how a
write
service is coded in the management byte 0. The
data length is 4 bytes for all parameters of the MOVI-PLC
®
basic
DHP11B.. controller.
This service is now transferred to the MOVI-PLC
®
basic
DHP11B.. controller when the
handshake bit changes. As a result, a
write
service on the MOVI-PLC
®
basic
DHP11B..
controller always has the management byte coding 32hex or 72hex.
Parameter setting
sequence with
PROFIBUS-DP
Taking the example of the
write
service, the following figure shows the parameter setting
sequence between higher-level controller and the MOVI-PLC
®
basic
DHP11B..
controller via PROFIBUS-DP. To simplify the sequence, the following figure only shows
the management byte of the parameter channel.
The parameter channel is only received and returned by the MOVI-PLC
®
basic
DHP11B.. controller while the higher-level controller is preparing the parameter channel
for the
write
service. The service is not activated until the moment when the handshake
bit is changed (in this example, when it changes from 0 to 1). The MOVI-PLC
®
basic
DHP11B.. controller now interprets the parameter channel and processes the
write
service. However, it continues to respond to all telegrams with handshake bit = 0.
The executed service is acknowledged with a change of the handshake bit in the
response message of the MOVI-PLC
®
basic
DHP11B.. controller. The higher-level
controller now detects that the received handshake bit is the same as the one that was
sent. It can now prepare another parameter setting procedure.
7 / MSB
6
5
4
3
2
1
0 / LSB
0
0/1
1)
1) Bit value is changed
1
1
0
0
1
0
Service identifier
0010 = Write parameter
Data length
11 = 4 bytes
Handshake bit
Must be changed on every new task in cyclical transmission.
Status bit
0 = No error during service execution
1 = Error during execution of service
Control
PROFIBUS-DP(V0)
Control Card MOVI-PLC
®
DHP11B (Slave)
--
0
0
110010XXX...
Æ
Parameter channel is received, but
not evaluated
Ä
0
0
110010XXX...
--
Parameter channel is
prepared for the write
service
Handshake bit is
changed and the service
is transferred to the
MOVI-PLC
®
basic
DHP11B.. controller
--
0
1
110010XXX...
Æ
Ä
0
0
110010XXX...
--
--
0
1
110010XXX...
Æ
Ä
0
0
110010XXX...
--
Write service is performed, hand-
shake bit is changed
Service confirmation is
received as the send
and receive handshake
bits are the same again
Ä
0
1
110010XXX...
--
--
0
1
110010XXX...
Æ
Parameter channel is received,
but not evaluated
0
0
I
Содержание MOVI-PLC basic DHP11B-T0
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