Automation Direct DL405 User Manual page 247

Analog Output The D4–04DA–1 Analog Output module requires 16 discrete output points in the
Configuration CPU. The module can be installed in any slot of a DL405 system, including remote
Requirements bases. The limitations on the number of analog modules are:
Check the user manual for your particular model of CPU for more information
regarding power budget and number of local or remote I/O points.
Before you begin writing the control program, it is important to take a few minutes to
understand how the module processes and represents the analog signals.
Channel Update The F4–04DA–1 module allows you to update the channels in any order. Your
Sequence control program determines which channel gets updated on any given scan. The
exact method depends on the operating mode you selected when setting the
jumper. With a DL440 or DL450 CPU, you can use immediate instructions to update
all four channels in the same scan (we'll show you how to do this later).
S
For local and expansion systems, the available power budget and
discrete I/O points.
S
For remote I/O systems, the available power budget and number of
remote I/O points.
Scan
Read inputs
Execute Application Program
Calculate the data
Write data
Write to outputs
F4–04DA–1 Analog Current Output
Scan N
Scan N+1
Scan N+2
Scan N+3
Scan N+4
13–7
Channel 1
Channel 2
Channel 3
Channel 4
Channel 1