SERIES AP440 ACROPACK
USER
’S MANUAL
Acromag, Inc. Tel: 248-295-0310
- 14 - http://www.acromag.com
- 14 -
www.acromag.com
Note 2: APCe7020E-LF is an
example of a carrier that uses the
50 pin Champ connector see
image of carrier.
Input channels of this module are divided into four ports of eight channels
each. Channels of a port share a common signal connection with each other
(ACOM, BCOM, CCOM, and DCOM). Isolation is provided between ports and
between each port and the AP logic. With respect to interrupt generation
and events, event polarities may be defined as positive (low-to-high), or
negative (high-to-low) for individual nibbles (groups of 4 input lines, or half
ports). Change-of-State detection would require 2 input channels--one
detecting positive events, one detecting negative events.
Field I/O pinouts are arranged to be compatible with similar AcroPack
models. This model is directly loopback compatible with the Acromag
Model AP445 Digital Output Module. Likewise, pin assignments are
identical to those of Acromag Model AP408.
Note that the inputs of this device are bipolar, and may be connected in any
polarity with respect to the port common. Further, do not confuse port
commons with signal common. For the AP440, port common only infers
that this lead is connected common to the 8 inputs of the port (a separate
port common for each port). Likewise, the port commons of the AP440
input module and AP445 output module are normally not connected
together for loopback interconnection of the AP440 and AP445 (see Figure 2
in Appendix A)
2.5 Noise and Earth Grounding Considerations
Input lines of the AP440 are optically isolated between the logic and field
input connections. Likewise, separate port commons facilitate port-to-port
isolation. Consequently, the field I/O connections are isolated from the
carrier board and backplane, thus minimizing the negative effects of ground
bounce, impedance drops, and switching transients. However, care should
be taken in designing installations to avoid inadvertent isolation bridges,
noise pickup, isolation voltage clearance violations, equipment failure, or
