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Programmable Pointer Registers
32 programmable pointer registers are provided for user definition. By using these
registers, frequently-accessed drive parameters that may be scattered throughout the
register map can be grouped together and accessed with a single holding register
read or write command.
Response Delay Function
A programmable network response delay function is available which forces the MDB-
100 to wait a certain minimum time before generating network responses to Modbus
commands. This function is useful when equipment such as radio modems (which
require a finite time to switch from receive to transmit mode) are used as Modbus
network bridges.
Network Watchdog
A network watchdog function is available to detect if communication with the master
controller has been interrupted. If an interruption is detected, several different drive
actions can be programmed to ensure that the process under control can be safely
and automatically driven to a desired state.
Modbus Network Connector
The network interface is a 3-position pluggable terminal block with the following
signals provided:
Pin Number Function
1 Modbus network RS485 “A” terminal
2 Modbus network RS485 “B” terminal
3 Network shield connection point
No network termination is provided on the MDB-100. Be sure to install proper RS485
network termination on the MDB-100 units that exist on the extreme endpoints of the
network bus. This can be accomplished by placing a 121Ω (±5%), 1/2W resistor
across the A and B network terminals of those 2 units.
Drive Network Connectors
Uses standard RJ-45 style 8-pin modular connectors. Any standard category-5
ethernet cable (found in most electronics and office-supply stores) 5 meters or less in
length can be used to connect the MDB-100 to the drives.
Supported Commands
The MDB-100 presents and receives drive data via Modbus commands 01 (read coil
status), 03 (read holding registers), 05 (force single coil), 06 (preset single register)
and 16 (preset multiple registers).