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7SR224 Argus Data Comms
5.4
IEC60870-5-101 Introduction
This section describes the IEC 60870-5-101 protocol implementation in the relays. The control system or local
PC acts as the master in the system with the relay operating as a slave responding to the master’s commands.
This protocol can be set to use any or all of the relays hardware interfaces (USB, Fibre Optic, RS232 and RS485).
Cause of Transmission
Shaded boxes are not required.
Blank = function or ASDU is not used.
Mark type identification/cause of transmission combinations:
“
X
” if used only in the standard direction
The cause of transmission (COT) for each information object type is listed below.
periodi
c, cyclic
backgr
o
u
nd sca
n
s
p
o
nt
a
ne
ou
s
initialized
reques
t or re
qu
ested
activati
on
activati
on con
fi
rmatio
n
deactiv
ati
on
deactiv
ati
on c
o
nfirma
tio
n
activati
on termi
n
atio
n
return i
n
fo
cau
s
e
d by a r
e
mo
te
cmd
return i
n
fo
cau
s
ed by a
local c
m
d
file tra
n
sfer
interro
gate
d by
grou
p <nu
m
b
e
r>
reques
t by
gro
u
p
<n> co
un
ter r
eques
t
unkn
o
w
n type
id
enti
fica
tio
n
unkn
o
w
n ca
use
of tra
n
s
m
issio
n
unkn
o
w
n c
o
m
m
on a
ddress
of
A
S
DU
unkn
o
w
n i
n
for
m
ati
on
objec
t a
ddress
1 2 3 4 5 6 7 8 9 10 11 12
13
20
to
36
37
to
41
44 45 46 47
<1> M_SP_NA_1
X
X
X
X
X
X
<2> M_SP_TA_1
X
X
X
X
<3> M_DP_NA_1
X X
X
X
X
X
<4> M_DP_TA_1
X
X
X
X
<5> M_ST_NA_1
X X
X
X
X
X
<6> M_ST_TA_1
X
X
X
X
<7> M_BO_NA_1
X X
X
X
<8> M_BO_TA_1
X
X
<9> M_ME_NA_1
X X X
X
X
<10> M_ME_TA_1
X
X
<11> M_ME_NB_1
X X X
X
X
<12> M_ME_TB_1
X
X
<13> M_ME_NC_1
X X X
X
X
<14> M_ME_TC_1
X
X
<15> M_IT_NA_1
X
X
<16> M_IT_TA_1
X
X
<17> M_EP_TA_1
X
<18> M_EP_TB_1
X
<19> M_EP_TC_1
X
<21> M_ME_ND_1
X X X
X
X
<30> M_SP_TB_1
X
X
X
X
<31> M_DP_TB_1
X
X
X
X
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Chapter 4 Page 55 of 76