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NT20S Status Control
Section 5-4
5-4-2 How to Control NT20S Functions
This section describes how to control the functions of the NT20S.
S Restrictions on allocating words
The PT status control area (PC → PT) can be allocated to the PC memory areas
listed in the following table.
Symbol C Series PCs Allocated CVM1/CV Series PCs Allocated
DM Data Memory f Data Memory f
CH Internal/Special Relay f Internal/Special Relay f
TIM Timer Timer
CNT Counter Counter
HR Holding Relay f –
AR Auxiliary Relay f Auxiliary Relay
LR Link Relay f –
f: OK : NG
Since all the CVM1/CV-series special auxiliary relays are allocated to the system,
they cannot be used for applications not related to the system.
The range of each memory area differs according to the PC type. See “Appendix L
PC Memory Map” (page 278 of the APPENDIX L) for more details.
Procedure 1. Use the support tool to set the area at the PC used for allocation of the PT sta-
tus control area (PC ³ PT).
2. Write a PC program for writing the control data into the “PT status control bit” of
the PT status control area.
S Timing for control of the PT status control bit
The PT status control bit is not read when the NT20S is started up. It is read, and
control executed, only when the contents of the PT status control bit are read for
the first time after the NT20S is started up.
Since NT20S status control is executed when the bit corresponding to the PT sta-
tus control bit changes, in order to perform the same control again the correspond-
ing bit must be specified again.
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