Appendix 5.4.3 Device Latch Function - Mitsubishi Q00JCPU User Manual

APPENDICES

Appendix 5.4.3 Device Latch Function

(1) Overview
This section explains how to use the latch function *1 of the Universal model QCPU,
which has been enhanced compared with the High Performance model QCPU.
(2) Methods for the latch function
Device data of the Universal model QCPU can be latched by:
(3) Latch function details
(a) Large-capacity file registers (R, ZR)
Model
Capacity of file register (R, ZR)
*1
in standard RAM
(b) Writing/reading device data to the standard ROM (SP.DEVST/S(P).DEVLD
Appendix 5 Method of replacing High Performance model QCPU with Universal model QCPU
* 1: The latch function is a function that allows device data retention even if power is turned OFF or
the CPU module is reset.
• Large-capacity file registers (R, ZR)
• Writing/reading device data to the standard ROM (SP.DEVST/S(P).DEVLD
instructions)
• Specifying internal user devices as latch ranges
File registers are the devices whose data can be latched by batteries.
The Universal model QCPU has file registers of larger capacities than the High
Performance model QCPU, offering a high-speed file registers processing. If
many device points are to be set for latching, it is advisable to use the file
registers.
TableApp.78 shows capacities of file registers for each CPU module.
TableApp.78 Capacities of file registers for each CPU module
Q03UDCPU,
Q02UCPU
Q03UDECPU
64k points 96k points
* 1: Use of a memory card can increase the number of points.
instructions)
Device data of the Universal model QCPU can be latched using the instructions
for writing/reading them to/from the standard ROM (SP.DEVST/S (P).DEVLD).
Utilizing the standard ROM allows data backup without batteries. This method is
effective for latching data that will be updated less frequently.
Q04UDHCPU, Q06UDHCPU,
Q04UDEHCPU Q06UDEHCPU
128k points 384k points
Q13UDHCPU, Q26UDHCPU,
Q13UDEHCPU Q26UDEHCPU
512k points 640k points
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