Mitsubishi FX Series PLC

Overview

The Mitsubishi FX PLC serial downloadable protocol is for communication between the Mitsubishi inverters and an OCS. This is a Master/Slave protocol.

CSCAPE Configuration

To configure OCS for the Mitsubishi protocol, select the Protocol Configuration from the Program menu in CSCAPE software. Select the appropriate protocol type on the desired port. To make sure that the Software is able to configure the equipment for the correct protocol, ensure MitsiFX.dll file is in the Protocols directory of the current working/open Cscape.

Serial Port Configuration

The default link settings for the terminal are : 9600 baud, Even parity, Seven data bits, One stop bit, RS232 communication and No handshaking.

Protocol Revisions

Version 1.00 Supports master only operation to the slave PLC.

Version 1.02 Supports 32 Bit Counters.

Version 1.03 Supports Blocks Over 32 Words.

Version 1.04 Supports FX2C & FX2N extended addressing.

Version 1.05 Supports True octal addressing for X and Y register types.

Node Address

No station numbers are required as only a one-to-one link is supported.

Register type Specification

Read and write operations support the following areas:

Word Types

Data registers
Special Data Registers
Timer Values
Counter Values

Thirty-two bit counters are automatically accessed when the appropriate counter Identifier is selected as the start Location.

Timer and Counter Presets are not directly accessible via communications as they are embedded in the ladder memory in the PLC. In order for the Operator Station to have access to the preset a Data Register should be used in the ladder rather than a constant.

Bit Types

Read and write operations are performed on blocks of sixteen bits with the bits being packed into words. Read and Write access supports the following bit types:

Relays (M)
Special Relays (M)
Inputs
Outputs
State Relays (S)
Timer Status
Counter Status

Register Type Ranges

	FX0	FX0s	FX0N	FX(V3.07)	FX(2c)	FX2N
Data Registers (D)
General use Registers	D0 – D29	D0 – D29	D0- D127	D0 – D199	D0 – D199	D0- D199
Latched Registers	D30 – D31	D30 – D31	D128 – D256	D200 – D999	D200 – D999	D200 – D7999
Diagnostic Registers	D8000 – D8026	D8000 – D8026	D8000 – D8039	D8000 – D8255	D8000 – D8255	D8000 – D0255
Relays (M)
General use Relays	M0 – M495	M0 – M495	M0 – M383	M0 – M499	M0 – M499	M0 – M499
Latched Relays	M496 – M511	M496 – M511	M384 – M511	M500 – M1535	M500 – M1535	M500 – M3071
Special Relays	M8000 - M8055	M8000 - M8055	M8000 – M8191	M8000 – M8255	M8000 – M8255	M8000 – M8255
Inputs (X) (Octal)
DC Inputs	X0 – X17	X0 – X17	X0 – X123	X0 - X377	X0 - X377	X0 - X377
Outputs (Y) (Octal)
Outputs	Y0 – Y15	Y0 – Y15	Y0 – Y77	Y0 – Y377	Y0 – Y377	Y0 – Y377
Timers (T)
Timer	T0 – T55	T0 – T55	T0 – T63	T0 – T255	T0 – T255	T0 – T255
Timer States (T)
Timer	T0 – T55	T0 – T55	T0 – T63	T0 – T255	T0 – T255	T0 – T255
Counters (C)
Counter ( 16 Bits)	C0 – C15	C0 – C15	C0 – C31	C0 – C199	C0 – C199	C0 – C199
Counter ( 32 Bits)	C235 – C254	C235 – C254	C235 – C254	C200 – C255	C200 – C255	C200– C255
Counter States (C)
Counter ( 16 Bits)	C0 – C15	C0 – C15	C0 – C31	C0 – C199	C0 – C199	C0 – C199
Counter ( 32 Bits)	C235 – C254	C235 – C254	C235 – C254	C200 – C255	C200 – C255	C200– C255
States (S)
States	S0 – S63	S0 – S63	S0 – S127	S0- S999	S0- S999	S0- S999

For further details of the above devices refer to the “FX Series Programmable Controllers” manual section “Devices in Detail”.

Connections

The Operator Station can be connected to the Mitsubishi FX PLC via the FX-232AW Communication Module. Alternatively the Operator Station can be connected directly into the PLC via the 25 Way Connector on the front of the PLC. However this may invalidate your Mitsubishi warranty. The following is the connection to be made direct into the PLC.

Network Communication Errors

In order to access the Network statistics, user must assign the “Network status register” in network configuration. The table below gives the details of statistics.

Number	Statistics	Location	Description

1	Update interval exceeded count	%Rx	This register explains number of times that the actual transaction scan time to complete all transactions exceeded specified update interval. Generally used as an indicator that an excessive number of triggered transfers or failed communication retries are occurring that is lengthening the expected transaction scan time. If the Update interval is set to zero (update as fast as possible), this 32-bit register alternately specifies the actual transaction scan time in mSec resolution.
2	No response count	%R(x+2)	This register explains number of times that a device(s) did not respond to a transaction. This includes ALL failed transaction, not just those after the retry count is exceeded.
3	Corrupt Response Count	%R(x+4)	This register explains number of times that a device(s) returned an invalid or failed response to a transaction. This includes ALL failed. Transaction, not just those after the retry count is exceeded.
4	Valid Response Count	%R(x+6)	This register explains total number of valid responses.

NOTE: %Rx: 32-bit network status register configured in Network configuration. For example: %R500(501).

Device Communication Errors

Error	Error Number	Description
INVALID_BLOCK	-203	Invalid size for data type.
NO_RESPONSE_FROM_PLC	-204	Timeout while waiting for remote node response.
INVALID_RESPONSE_FROM_PLC	-205	Corrupted response from remote node.
INVALID_INITIALISATION	-207	Internal Error - Unable to open port.