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1. Overview
The Modbus module (ML11) is used to connect T2E, T2N, or EX100 PLCs to a Modbus
Master. The addition of the EX10-MML11 (MODBUS Module) allows the T2E, T2N or EX100
PLC to communicate via standard MODBUS RTU protocol. This allows quick and easy
access to the PLC registers by a standard MODBUS Master.
Using the ML11 Modbus module any Modbus Master can read the status of registers in the
PLC and write to registers in the PLC. This allows the Modbus Master to know the status of
inputs to the PLC (both digital and analog) and to control the outputs of the PLC (also both
digital and analog).
The ML11 Modbus module cannot be a Modbus master, only a modbus slave. It has one
RS485 port for connection to the Modbus master. The preferred location of the EX10-MML11
is next to the CPU. However, the module may be located in any slot to the right of the CPU.
The CPU module can be any of the following:
EX10-MPU11 EX100 CPU, now obsolete
EX10-MPU12A EX100 CPU, now obsolete
TPU215—S T2 CPU now obsolete
TPU224--S T2 CPU, now obsolete
TPU234E-S T2E CPU (replaces all obsolete CPUs)
TPU215N-S T2N CPU, basic
TPU235N-S T2N CPU, with Ethernet
TPU245N-S T2N CPU, with Ethernet and Tosline S20
The ML11 Modbus module is also used to connect a T2 or EX100 PLC into the Toshiba
ECBUS. The ECBUS allows the PLCs to share data with Toshiba’s EC300 series loop
controllers. The ECBUS is a LAN (local area network) which allows multiple EC300s and
T2/EX100 PLCs to share data. For more information on the ECBUS, please refer to ECBUS
Transmission Interface Manual, see Additional References.