Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
616 Protocol Configuration
When the system driver is Modbus RTU Slave, the following
communication port parameters can be changed:
Modbus RTU Slave Communications Configuration Parameters
Parameter Options Programming
Software Default
Channel Channel 0 0
Driver Modbus RTU Slave
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K 19.2K
Parity none, even, odd none
Node Address 1…247 decimal 1
Control Line No Handshaking, Half-Duplex Modem (RTS/CTS Handshaking), No Handshaking (485
Network)
No Handshaking
Inter-character
Timeout (x1 ms)
0…6553 (can be set in 1 ms increments); 0 = 3.5 character times
Specifies the minimum delay between characters that indicates the end of a message packet.
0
Modbus Data Table
File Number
Assignment
(Must be Binary or
Integer file type)
Coils (Discrete outputs, Modbus addresses 0001…4096) range = 3…255, 0 = no file 0
Contacts (Discrete inputs, Modbus addresses 10001…14096) range = 3…255, 0 = no file 0
Input Registers (Read Only, Modbus addresses 30001…30256) range = 3…255, 0 = no file 0
Holding Registers (Read/Write, Modbus addresses 40001…40256) range = 3…255, 0 = no
file
0
RTS Off Delay
(x20 ms)
0…65535 (can be set in 20 ms increments)
Specifies the delay time between when the last serial character is sent to the modem and
when RTS is deactivated. Gives the modem extra time to transmit the last character of a
packet.
0
RTS Send Delay
(x20 ms)
0…65535 (can be set in 20 ms increments)
Specifies the time delay between setting RTS until checking for the CTS response. For use
with modems that are not ready to respond with CTS immediately upon receipt of RTS.
0
Pre Transmit Delay
(x1 ms)
0…65535 (can be set in 1 ms increments)
When the Control Line is set to No Handshaking, this is the delay time before transmission.
Required for 1761-NET-AIC physical Half-Duplex networks. The 1761-NET-AIC needs 2 ms of
delay time to change from receive to transmit mode.
When the Control Line is set to Half-Duplex Modem, this is the minimum time delay between
receiving the last character of a packet and the RTS assertion.
0
Stop Bits 1,5,2 1
Data Bits
7 8
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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes