Toshiba nv Series - PI918 Scan Transmission Format

Chapter2 Interface information of the PI918
6F8C1370
1010
2.3. PI918 scan transmission format
Theinternalcounter,register,andsettinginformationofthePI918is
transmittedatthescancycle.




























Figure 2.3. PI918 scan transmission format
15870
0
CH1countre
g
ister
(1)
1
CH2countre
g
ister
2
CH3countre
g
ister
3
CH4countre
g
ister
4
CH5countre
g
ister
5
CH6countre
g
ister
6
CH7countre
g
ister
7
CH8countre
g
ister
8
CH1holdre
g
ister
(2)
9
CH2holdre
g
ister
10
CH3holdre
g
ister
11
CH4holdre
g
ister
12
CH5holdre
g
ister
13
CH6holdre
g
ister
14
CH7holdre
g
ister
15
CH8holdre
g
ister
16
CH1alarmre
g
ister
(3)
17
CH2alarmre
g
ister
18
CH3alarmre
g
ister
19
CH4alarmre
g
ister
20
CH5alarmre
g
ister
21
CH6alarmre
g
ister
22
CH7alarmre
g
ister
23
CH8alarm re
g
ister
24
Module
p
arameter
(5)
Command
(4)
25
CH4P.P. CH3P.P. CH2P.P. CH1P.P.
(6)

26
CH8P.P. CH7P.P. CH6P.P. CH5P.P.
27
0 Interru
p
tstatus
(7)

(Note)Intheformatdescription,fourbitesinthestartingheaderareexcluded. 
(1)Thecountregistershowsthecurrentcountvalue(0to32767).
(2)Theholdregisterholdsthecountvalueunderthecountholdcondition.
(3)Thealarmregisterreturnsthealarmvaluewrittenuponscanreception.
(4)Thecommandreturnsthecommandinformationwrittenatscanreception.
(5)Themoduleparameterreturnsthesettinginformationreceivedasamessage
uponstartup.
(6)TheP.P.(pointparameter)returnsthesettinginformationreceivedasamessage
uponstartup(consistsof4-bitinformationofEP,AL,SP,andSVforeach
channel).
(7)Interruptstatusisatogglestatuswhoseinitialvalueis'0'.  Thebitstate
correspondingtoeachchannelisinvertedforeachinterruptcondition.
 76543210
CH8 CH7 CH6 CH5 CH4 CH3 CH2 CH1
(Word)
(bit)
(bit)