The CM 7021 provides one analog output channel capable of providing 0 to
10VDC, 4 to 20mA, or 0 to 20mA with 12-bit resolution. The module is encased in
a rugged industrial-grade plastic casing to survive harsh plant and laboratory
environments. It is easy to mount on
a desktop, DIN rail, wall, or piggyback to another CM 7000 module. 3000VDC
isolation voltage protects from stray power spikes.
The dual watchdog timer monitors both the module and the host PC, re-starting
the module if it halts, or going into safe mode if contact with the host PC is
- Host Watchdog Timer (software): If contact is lost with the
host PC, after 5 seconds (user-set in 100ms increments) the output lines on the
modules will automatically go into their safe states (user-selectable) to
prevent unpredictable damage.
- Module Watchdog Timer (hardware): If the module halts, the
module watchdog timer will reset the module and any output lines will revert to
their pre-defined power-on values.