7
- 10
7.2 Access to AnS Series Corresponding Special Function Module
7
COMMUNICATION WITH INTELLIGENT FUNCTION
MODULE
7.2 Access to AnS Series Corresponding Special Function Module
(1) Effects of quicker access to the special function moduleNote72
The Q series CPU module can process at higher speed, taking shorter time to scan.
When the FROM/TO instruction is frequently executed for the special function module
during a short scan, the processing of the target special function module may not be
normally terminated.
In this case, match the FROM/TO instruction execution interval to the processing
time/conversion time using the timer, constant scan, etc. of the special function
module.
(
(2) below)
(2) Countermeasures against the effects of quicker access to the special
function module
To use the AnS-compatible special function module, adjust the execution time with
SM415 (2n-ms clock) and SD415 (2n-ms clock setting).
The initial value of SD415 is "30." When SD415 is used for interlock of the FROM/TO
instruction, the FROM/TO instruction is executed at every 120 ms.
POINT
To change the clock value of SM415, store the new value in SD415.
For details of SM415, see appendix 1. For details of SD415, see Appendix 2.
Note72
Diagram 7.8 Countermeasure program example
Basic
Process
Redundant
Note7.1
Note7.1
Note7.1
Since the Basic model QCPU, Process CPU and Redundant CPU do not support the AnS series
correponding special function modules, it is not necessary to be conscious of the description in
this section.
Basic
Note7.1
Process
Note7.1Note7.1
Redundant
SM400
M0VP
SM415
FROMP
K30
H0
SD415
K1 K1DO
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