Control and status area
Section 5-3
62
IR n.01
I/O communication inhibit
0: I/O communication is enabled.
1: I/O communication is disabled. A transition from 0 to 1
changes the PROFIBUS-DP network state from ‘Operate’ via
‘Clear’ to ‘Stop’. All remote outputs will therefore be reset.
Data in the input buffer of the Unit will no longer be updated
and transferred to the PLC anymore (I/O refresh time will
decrease). The PLC’s output data however, is still transferred
to the output buffer of the Unit. This ensures that the output
buffer contains valid output data at the moment the communi-
cation is enabled again.
When I/O communication is disabled, the output mailbox is
disabled as well. It is possible to send mailbox commands to
the Unit, but they are not transferred to the output mailbox.
Because no commands are put in the output mailbox, no
responses will be received in the input mailbox.
IR n.02
Input mailbox clear
0: No specific action.
1: Each I/O refresh, one unprocessed response (if available) is
removed from the input mailbox.
IR n.03~06 Not used by C200HW-PRM21.
IR n.07
Issue control command
0: No control commands are issued.
1: Each I/O refresh, one control command is issued.
The control command is specified by IR n.09~13, and the
destination is specified by IR n+1. No control command is
transferred to the output mailbox if either the RUN-bit (IR
n.00) is not set or if the communication is inhibited (IR n.01) or
the output mailbox is not ready to receive a command due to a
full input mailbox. In the next PLC cycle, IR n+2.11 will
indicate whether the control command was accepted or not.
Each fieldbus cycle, only one control command will be
transmitted.
IR n.08
Not used by C200HW-PRM21.
IR n.09~13 Specification of the PROFIBUS-DP control command.
Bit
Command
Meaning
09
Clear_Data
Clear output data
10
Unfreeze
Unfreeze input data
11
Freeze
Freeze input data
12
Unsync
Unsynchronise output data
13
Sync
Synchronise output data
When activated simultaneously, Unsync has priority over Sync,
Содержание C200HW-PRM21
Страница 1: ...C200HW PRM21 PROFIBUS DP Master Unit OPERATION MANUAL Cat No W349 E2 2...
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Страница 5: ...C200HW PRM21 PROFIBUS DP Master Unit Operation Manual Produced May 2000...
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Страница 126: ...Authorised Distributor Cat No W349 E2 2 Note Specifications subject to change without notice Printed in the Netherlands...