Hardware reference guide

CPU Modules
140
35013379 02 October 2007
Specifications The following table shows the specifications for the CPU21304 controller module.
Specifications
User Logic/Reference
Capacity
984 Ladder Logic Discrete Register Extended
Register
32 k words 64 k 57 k 80 k
48 k words 64 k 28 k 0 k
57,766 4XX registers max
Only if:
0XXX = 16 and
1XXX = 16 and
3XXX =16
Discrete 64 k - any mix
Local I/O (Main Backplane)
Maximum I/O Words 64 In and 64 Out*
Maximum Number of I/O Racks 2 (Requires expander)
Remote I/O
Maximum I/O Words per Drop 64 In and 64 Out*
Maximum Number of Remote
Drops
31
Distributed I/O
Maximum Number of Networks
per System
3**
Maximum Words per Network
(For every DIO drop, there is a
minimum of words input of
overhead.)
500 In and 500 Out
Maximum Words per Node 30 In and 32 Out
Watchdog Timer 250 ms (software adjustable)
Logic Solve Time 0.3 ms / k to 1.4 ms / k
Battery 3 V Lithium
Service Life 1200 mAh
Shelf Life 10 years with 0.5% loss of capacity per year
Battery Load Current @ Power-off
Typical 5 μA
Maximum 110 μA
Communication
Modbus (RS-232) 1 serial port (9-pin D-shell)
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com