3
SPECIFICATIONS
3.1 Performance Specifications
3 - 1
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
MODBUS(R) STANDARD
FUNCTIONS
5
FUNCTION
6
PRE-OPERATIONAL
PROCEDURES AND
SETTINGS
7
PARAMETER SETTING
8
UTILITY PACKAGE
(GX Configurator-MB)
CHAPTER3 SPECIFICATIONS
This chapter explains the performance specifications of the QJ71MB91, interface
specifications, I/O signals for communications with programmable controller CPU, and
buffer memory.
Please refer to the following manual for general specifications.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
3.1 Performance Specifications
This section provides the performance specifications of QJ71MB91.
(Continued on next page)
Table3.1 Performance specifications
Item Specifications Reference
Transmission
specifications
Number of interfaces
RS-232 1 channel, RS-422/485 1 channel
-
Transmission speed Section 6.6
300 600 1200 2400
4800 9600 14400 19200
28800 38400 57600 115200 (bps)
Communication is available with total transmission
speed of two interfaces within 115200bps.
Transmission
distance
(Overall distance)
RS-232 Max. 15m (49.2 ft.) -
RS-422/485 Max. 1200m (4592.4 ft.) (Overall distance) -
Master
function
Automatic
communication
function
Number of slaves
*1
32 per channel -
Function (for send) 7 functions Section 7.2.1
Input area size 4k words
Section 3.5.1
Output area size 4k words
Communication
by dedicated
instructions
(MBRW, MBREQ)
Number of instructions that
can be executed
concurrently
*2
1 per channel
CHAPTER 10
Function (for send)
MBRW instruction: 9 functions
MBREQ instruction: 19 functions
Input area size Max. 253 bytes per instruction
Output area size Max. 253 bytes per instruction
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