User guide

<3. Functions>
3-2
IM 11B06E01-01E
3.3 Alarm information
The conditions of communication with analyzers are mapped as alarm information to the input
relay.
In operation:
ThisshowsthatASGWisaccessingtheanalyzersorPCASAalyzerServerspeciedinthemap-
pingle.
Communication failure:
This shows that a time-out error is occurring in communicating with an analyzer. Network line or
analyzer failure may cause the error.
ForanalyzersconnectedtoPCAS,communicationerrorisindicatedbybothcommunication
statusesbetweenASGWandPCASoranalyzersandPCAS.
Write failure:
Itshowsthatawriteerroroccursonanalyzer.Thefailureisresetwhenthenextwritingsucceeds.
PCASforARCNET(PCAS/ARC)hasmultiplevirtualanalyzertables,eachofwhichASGWac-
cesses.
Alarminformationiscreatedforeachanalyzer,notfortheentirePCAS/ARC.
3.4 Modbus interface table
ASGW has the function of Modbus RTU Slave.
This system covers the following function code and number of data with Modbus communication
Modbus interface table
Function Function
Code
BIT/WORD Maximumdatabyaccessinone
communication packet.
Read coil status 1(0x01) BIT 2000 bits
Read input relay status 2(0x02) BIT 2000 bits
Read holding registers 3(0x03) WORD 125 words
Read input registers 4(0x04) WORD 125 words
Write coil 5(0x05) BIT 1 bit
Write single register 6(0x06) WORD 1 word
Loopback test 8(0x08) WORD 1 word
Write multiple coils 15(0x0F) BIT 800 bits
Write multiple registers 16(0x10) WORD 100 words
ReaddeviseID* 43(0x2B) ASCII string
*: DeviceIDconsistsofvendor,productcodeandrevisionnumber.
Vendor : “YOKOGAWA”
 Product: ”ASIU”
 REVISION: “1.01.01”(example)
Update rate:
ASGWaccessesanalyzersevery100msandsupportseachreadandwriterequestsequentially.
4th Edition : Nov. 22, 2011-00