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FX Series Programmable Controllers Devices in Detail 4
4-3
4.3 Auxiliary Relays
Device Mnemonic:
M
Purpose:
Internal pro
g
rammable controller status fla
g
Alias:
Auxiliar
y
(coil/ rela
y
/ contact/ fla
g
)
M (coil/ rela
y
/ contact /fla
g
)
M (bit) device
Available forms:
NO ( ) and NC contacts and output coils ( )
(see example device usa
g
e for references)
Devices numbered in:
Decimal, i.e. M0 to M9, M10 to M19
Further uses:
General stable state auxiliar
y
rela
y
s - see pa
g
e 4-3
Batter
y
backed/ latched auxiliar
y
rela
y
s - see pa
g
e 4-4
Special dia
g
nostic auxiliar
y
rela
y
s - see pa
g
e 4-5
Example device usage:
4.3.1 General Stable State Auxiliary Relays
• A number of auxiliar
y
rela
y
s are used in the PLC. The coils of these rela
y
s are driven b
y
device contacts in the PLC in the same manner that the output rela
y
s are driven in the
pro
g
ram.
All auxiliar
y
rela
y
s have a number of electronic NO and NC contacts which can be used b
y
the PLC as required. Note that these contacts cannot directl
y
drive an external load. Onl
y
output rela
y
s can be used to do this.
• For more information about device availabilit
y
for individual PLC’s, please see chapter 8.
For device availabilit
y
when usin
g
an FX fitted with an FX2-40AW/AP please see pa
g
e 9-6.
PLC FX0(S) FX0N FX FX(2C) FX2N(C)
General auxil-
iar
y
rela
y
s
496
(M0 - 495)
384
(M0 - 383)
500
(M0 - 499)
500
(M0 - 499)
500
(M0 - 499)
Batter
y
backed/
latched rela
y
s
16
(M496 - 511)
128
(M384 - 511)
524
(M500 -
1023)
1036
(M500 -
1535)
2572
(M500 -
3071)
Total available 512
512
1024
1536 3072
X0
X1
1
M507
2
M507
Available devices: