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2-9Read Variable Area ............................................................................. 2-9Write Variable Area ........................................................................... 2-10Read Controller Attributes ................................................................. 2-12Read Controller Status ......................................................................

2-13Echoback Test .................................................................................. 2-14Operation Command ......................................................................... 2-152.4Response Code List ................................................................................. 2-20SECTION 3Communications Data for CompoWay/F and SYSWAY3.1Variable Area (Setting Range) List ............................................................. 3-23.2Status .......................................................................................................

3-15XISECTION 4SYSWAY (E5@J and E5@X Format) Communications Procedures4.1Data Format ............................................................................................... 4-2Command Frame Format .................................................................... 4-2Response Frame ................................................................................ 4-3Communications Data ......................................................................... 4-3SYSWAY Command Lists ................................................................... 4-44.2Command Descriptions ..............................................................................

4-5Read Process Value ........................................................................... 4-5Write Set Values ................................................................................. 4-6Read Set Values and MV Monitor ....................................................... 4-7Select Communications Writing .......................................................... 4-9SECTION 5Modbus Communications Procedure5.1Data Format ............................................................................................... 5-2Command Frame ................................................................................

5-2Response Frame ................................................................................ 5-4Error Codes ......................................................................................... 5-55.2Function List ............................................................................................... 5-65.3Variable Area .............................................................................................. 5-75.4Detailed Description of the Services ..........................................................

5-9Read Variable Area ............................................................................. 5-9Write Variable Area ........................................................................... 5-11Operation Commands ....................................................................... 5-14Echoback Test .................................................................................. 5-19SECTION 6Communications Data for Modbus6.1Variable Area (Setting Range) List .............................................................

6-26.2Status ....................................................................................................... 6-15AppendixASCII List .............................................................................................................A-2Index ..............................................................................................................................I-1Revision History ........................................................................................................... R-1XIISECTION 1Communications MethodsThis section briefly describes the supported communications methods andhow to wire equipment. Refer to this section when setting up equipment.1.1Overview of Communications Methods ........................

1-2Introduction.............................................................. 1-2Communications Specifications............................... 1-3Transmission Procedure.......................................... 1-3Interface...................................................................

1-4Wiring ...................................................................... 1-4Communications Parameters .................................. 1-6Communications Parameter Setup .......... 1-6Communications Parameters ................... 1-71-1SECTION 1 Communications MethodsOverview1.1 Overview of Communications Methods■ IntroductionThe program for the communications functions are created on the hostcomputer, and the E5CN/AN/EN’s parameters are monitored or set from thehost computer. Therefore, the description provided here is from the viewpointof the host computer.CompoWay/F is OMRON’s standard communications format for general serialcommunications.

This format uses a standard frame format as well as thewell-established FINS* commands used for OMRON’s PLCs. Therefore, it cansimplify communications between components and the host computer.*FINS (Factory Interface Network service)The FINS protocol provides message communications between controllers inOMRON FA networks.Modbus is a standard communications control method that conforms to theModicon Company’s RTU-mode Modbus Protocol (PI-MBUS-300 Revision J).Supports functions equivalent to the CompoWay/F Read Variable Area, WriteVariable Area, Operation Command, and Echoback Test functions.The E5CN/AN/EN supports the following communications functions.• Reading/writing of parameters• Operation instructions• Selection of setup levelsCommunications are subject to the following condition:• Parameters can be written only when the “communications writing” parameteris set to ON (enabled).1-21.1 Overview of Communications Methods■ Communications SpecificationsRS-485: MultidropRS-232C: Point-to-pointCommunications method(See note 1.)RS-485 (2-wire, half-duplex)/RS-232CSynchronization methodStart-stop synchronizationCommunications baudrate (See note 2.)1,200, 2,400, 4,800, 9,600, 19,200 or 38,400 bpsCommunications codeASCIICommunications databits (See note 2.)7 or 8 bitsCommunications stopbits (See note 2.)1 or 2 bitsError detectionVertical parity (none, even, or odd)FCS (Frame Check Sequence) with SYSWAYcommunicationsBCC (Block Check Character) with CompoWay/FcommunicationsCRC-16 (Cyclic Redundancy Check 16) with Modbus communicationsFlow controlNoneInterfaceRS-485/RS-232CRetry functionNoneCommunications buffer40 bytesCommunicationsresponse wait time0 to 99 ms, default time: 20 msOverviewTransmission line connectionNote 1: RS-232C is supported by E5AN and E5EN only.Note 2: Communications speed, data bits, stop bits and vertical parity caneach be set independently in the communications setting level.Highlighted values indicate default settings.■ Transmission ProcedureWhen the host computer transmits a command frame, the E5CN/AN/ENtransmits a response frame that corresponds to the command frame.

A singleresponse frame is returned for each command frame. The following diagramshows the operation of the command and response frames.Command frameCommand frameHost computerE5CN/AN/ENResponse frameAllow a wait time of at least 2 ms before the next command is sent after the hostcomputer receives a response from the E5CN/AN/EN.1-3SECTION 1 Communications Methods■ InterfaceCommunications with the host computer are carried out through a standardRS-485 interface or RS-232C interface (E5AN/E5EN). Use a K3SC InterfaceOverviewConverter for RS-485 and RS-232C interface conversion.■ WiringRS-485• The RS-485 connection can be either one-to-one or one-to-N. Up to 32 unitsincluding the host computer can be connected in a one-to-N system.• The total cable length is 500 m max.• Use a shielded twisted-pair cable with wires of a thickness of AWG24(0.205 mm2) to AWG14 (2.081 mm2).Communications transceiverHost computer sideRS-485E5CN/AN/EN sideRS-485AbbreviationPin12A (−)11B (+)AbbreviationFG−+SGTXRX6.8 VShieldTerminator120 Ω(1/2 W)A < B: "1" MarkA > B: "0" SpaceShieldE5CN/AN/EN sideEnd nodeRS-485AbbreviationPin12A (−)11B (+)Use a 120 Ω (1/2 W)terminator.Specify both ends of the transmission path including the hostcomputer as the end node (that is, connect terminators to bothends).

Use a terminating resistance of at least 54 Ω.Match the communications specifications of the E5CN/AN/EN and the hostcomputer. When using a 1: N connection, set the same communicationsspecifications in all of the Units. (Of course, each Unit must have a unique unitnumber.)This section explains how to set the E5CN/AN/EN’s communications specifications.

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