Control and status area
Section 5-3
61
5-3-1
Control words
The two control words, IR n and IR n+1, are shown below.
Any bits of the control words which are not assigned to a specific function,
can freely be used as work bits. These bits will be ignored by the C200HW-
PRM21.
IR n.00
Run
0: No exchange of I/O data between PLC and remote I/O, and
no processing of mailbox commands will take place. A
transition from 1 to 0 will clear or hold the outputs depending
on the value set in DM m+17. Holding remote outputs is only
available in asynchronous data exchange mode.
1: Unit in normal operation; exchange of I/O data with PLC, and
processing of mailbox commands are enabled.
The purpose of this bit is to allow detection of a fatal PLC error. A
fatal PLC error will reset the whole IR area; the Unit monitors IR
n.00, and on a 1
→
0 transition it performs the action specified in
the Unit settings (see section 5-1-4).
Note:
It is recommended to always set this bit ON during PLC
program execution. See also Appendix Appendix A.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
IR n
Run
I/O communication inhibit
Input mailbox clear
Issue control command
Clear_Data
Unfreeze
Freeze
Unsync
Sync
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
IR n+1
Station address
Group select
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 8
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...