Overview Of Message Communications; Message Communications Operations; Types Of Message Communications - Omron 3G3MV-PDRT2 User Manual

Message Communications
6-1

Overview of Message Communications

Message Communications Operations

■
Message communications enable data to be exchanged as required between nodes (i.e., between
Masters or between Masters and Slaves) on a DeviceNet Network. For example, the accumulated
data from a given PLC can be read from another PLC, and constants from various Slaves can be
changed from a PLC. To use message communications, however, both nodes involved in the data
exchange must support message communications.
DeviceNet Master Unit
CS1W-DRM21(-V1)
CJ1W-DRM21
Note When the DeviceNet Communications Unit/Card is used, the RS-422/RS-485 of the Inverter
cannot be used for communications.

Types of Message Communications

■
DeviceNet message communications are broadly divided into the two categories described below. Of
these two categories, the Inverter's DeviceNet Communications Unit/Card supports explicit mes-
sages.
• Explicit Messages
Explicit messages are defined by DeviceNet. The class, instance, and attribute are specified for
executing message communications. The messages are the same for all Inverter products, so
messages can be exchanged in the same way with masters made by other manufacturers.
• FINS Messages
Messages can be exchanged using FINS commands between DeviceNet nodes (Masters and
Slaves) that support FINS messages. (FINS commands are actually sent and received using
DeviceNet explicit messages.)
Note Message communications are supported by CV-series, CS/CJ-series, and C200HX/HG/HE
PLCs, but not by C200HS PLCs.
6-2
Message communications function
CMND (490)
3G3MV-PDRT2 DeviceNet
Communications Unit (for 3G3MV Inverters)
3G3RV-PDRT2 DeviceNet Communications
Card (for 3G3RV/3G3FV Inverters)
Note: T-branch wiring using Thin Cables
Reading Inverter
output current
3G3MV, 3G3RV, or
3G3FV Inverter
FRE F FOU
T IOU T
MNT R
F/R
LO/R E PRG
M
RU N
MIN MIN
ST OP FRE QU ENC FRE QU ENC MAX MAX
Y Y
RE SE T
DIGI TAL DIGI TAL
OPE RAT OPE RATO
PJVO P-14 PJVO P-14 OR R
0 0
SY SD R
IV E
3G 3M V R U N
IN VE RT
ER
AL AR M
20 0V 3P 20 0V 3P
HA SE HA SE
NPIT 3129 NPIT 3129
W AR NI NG
7-40 4-1 7-40 4-1 0.1 kW 0.1 kW
-
Ri sk of
Re ad
ma nu al ele ctr ic
Wa it 1 be for e
sh oc k.
mi nu te ins tal ling
dis co nn for ca pa
.
ec tin g cito r dis
To co po we r
nfo rm su pp ly. ch arg e
to gro to aft er
un d the req uir
AV ER TI su pp ly em en ts,
SS M EN ne utr al ma ke
su re
T for 40
Lis ez - Ris qu e 0V cla
ma nu de de ch ss.
el ava ele ctr iqu '
Att en de arg e
z 1 min nt d'in e.
jus ceq sta ller
' ute ap ' .
u'a les res d'e
Po ur rep con de ' tac hm
' on dre nsa teu
le ne utr ' en t d'e
au x exi rs son ' lec tric
e est a ge nce t de cha ' ite, '
la ma sse s rge s.
, s'a ssu '
po ur la
- rer qu
ser ie ' e~
40 0V .
Chapter 6