Specifications

App - 84
Appendix 9.1.2 Interlock program example
Interlocks should be applied to the programs according to the link status of the host and
other stations.
The following example shows an interlock in the communication program that uses the
link status of the host (SB47, SB49) and the link status of station number 2 (SW70 bit 1,
SW74 bit 1).
(Example)
SB49 :Host cyclic status
SB47 :Host baton pass status
SB20 :Network module status
SW70 :Other station baton pass
status
SW74 :Other station cyclic status
Interactive
communication
program with
station No. 2
Program of transient transmission
Program of cyclic transmission
Set the following values for the timer constant K
.
Baton pass status
(T0, T2)
More than (link scan time
6) + (target station CPU sequence scan time 2)
Cyclic transmission status
(T1, T3)
More than (link scan time
3)
Reason: This setting prevents the control from stopping even if the network detects an
instantaneous error due to a faulty cable condition, noise interference, etc.
Also, the multipliers of 6, 2 and 3 should only be considered as a guideline.