Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
516 Protocol Configuration
DF1 Half-Duplex Slave Configuration
When the system driver is DF1 Half-Duplex Slave, the following
parameters can be changed:
DF1 Half-Duplex Slave Configuration Parameters
Parameter Options Programming
Software
Default
Channel MicroLogix 1100: Channel 0 0
Driver DF1 Half Duplex Slave
Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K 19.2K
Parity none, even none
Node Address 0 to 254 decimal (255 is reserved for broadcast) 1
Control Line No Handshaking, Half-Duplex Modem (RTS/CTS Handshaking)
No Handshaking (485 Network)
(1)
No
Handshaking
Error Detection CRC, BCC CRC
EOT Suppression enabled, disabled
When EOT Suppression is enabled, the slave does not respond when polled if no message is
queued. This saves modem transmission power when there is no message to transmit.
disabled
Duplicate Packet
(Message) Detect
enabled, disabled
Detects and eliminates duplicate responses to a message. Duplicate packets may be sent under
noisy communication conditions if the sender’s Message Retries are set greater than 0.
enabled
Poll Timeout
(x20 ms)
0 to 65535 (can be set in 20 ms increments)
Poll timeout only applies when a slave device initiates a MSG instruction. It is the amount of time
that the slave device waits for a poll from the master device. If the slave device does not receive a
poll within the Poll Timeout, a MSG instruction error is generated, and the ladder program needs
to re-queue the MSG instruction. If you are using a MSG instruction, it is recommended that a Poll
Timeout value of zero is not used. Poll Timeout is disabled when set to zero.
3000
RTS Off Delay
(x20 ms)
0 to 65535 (can be set in 20 ms increments) – only with control line set to “Half Duplex Modem
(RTS/CTS Handshaking)”
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
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Allen-Bradley MicroLogix 1100 Specifications

General

Processor	32-bit
Programming Software	RSLogix 500
Mounting	DIN rail or panel mount
Power Supply	24V DC
Type	Compact PLC
Digital Inputs	12
Digital Outputs	8
Analog Inputs	4 (depending on model)
Analog Outputs	Optional with expansion module
Programming Language	Ladder Logic
Operating Temperature	0 to 55 °C (32 to 131 °F)
Series	MicroLogix