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MELSEC-Q
4 THE EXCHANGE BETWEEN THE PLC AND BUFFER MEMORY
(2) Q/QnA series
The device codes and usable device numbers are as follows.
Device Code
Device
Usable Device Number
156 (&H9C)
X (Input)
0 to 1FFF
157 (&H9D)
Y (Output)
0 to 1FFF
144 (&H90)
M (Internal relay)
0 to 8191
146 (&H92)
L (Latch relay)
0 to 8191
147 (&H93)
F (Annunciator)
0 to 2047
148 (&H94)
V (Edge relay)
0 to 2047
160 (&HA0)
B (Link relay)
0 to 1FFF
168 (&HA8)
D (Data register)
0 to 12287
180 (&HB4)
W (Link register)
0 to 1FFF
193 (&HC1)
TS (Timer [contact])
0 to 2047
192 (&HC0)
TC (Timer [coil])
0 to 2047
194 (&HC2)
TN (Timer [current value])
0 to 2047
199 (&HC7)
SS (Accumulated timer [contact])
0 to 2047
198 (&HC6)
SC (Accumulated timer [coil])
0 to 2047
200 (&HC8)
SN (Accumulated timer [current value]
0 to 2047
196 (&HC4)
CS (Counter [contact])
0 to 1023
195 (&HC3)
CC (Counter [coil])
0 to 1023
197 (&HC5)
CN (Counter [current value])
0 to 1023
161 (&HA1)
SB (Link special relay)
0 to 7FF
181 (&HB5)
SW (Link special register)
0 to 7FF
152 (&H98)
S (Step relay)
0 to 8191
162 (&HA2)
DX (Direct input)
0 to 1FFF
163 (&HA3)
DY (Direct output)
0 to 1FFF
204 (&HCC)
Z (Index register)
0 to 15
175 (&HAF)
R (File register [for normal access])
0 to 32767
45232 (&HB0B0)
ZR (File register [for continuous access])
0 to FE7FF
note
(1) Accesses the device memory within the A/QnACPU.
(2) For Q/QnACPU, the internal relays (M), latch relays (L), step relays (S) of the
internal user are all separate devices.
(3) The usable device numbers in the chart are all usable ranges during default
assignment. If the device ranges are changed using parameter settings, the
device range can be accessed after the change is made.
