Chapter 4 Setup Menus 29
4.6 Analog Expander Setup Menu
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By connecting two optional AX-7 or AX-8 analog expanders (with outputs
of 0-20 mA, 4-20 mA, 0-1 mA or ±1mA) to the PM172EH, an additional 14
(with AX-7) or 16 (with AX-8) external analog output channels can be
provided. This menu allows you to select an output value, and its zero
and full scales, for these extended channels.
Channels A1-1 to A1-8 correspond to the first analog expander, and
channels A2-1 to A2-8 correspond to the second one. The setup menu
operates in the same way as the Analog Output Setup Menu (see Section
4.5).
NOTES
1. The analog expander outputs operate through communications port #2 in RS-
422 and RS-485 mode. In both cases, connections between the instrument and the
analog expander should be made using four wires.
2. Settings you made for analog expander outputs will not be in effect until the
analog expander output is globally enabled in the instrument. To activate the
analog expander output, set the analog expander option in the User Selectable
Options setup (see Section 4.12) as it is set in your expander. Do not enable the
analog expander output when you do not have the analog expander connected to
the instrument, otherwise the computer communications will become garbled.
3. If you have the analog expander connected to your instrument, you will not be
able to communicate with the instrument via a PC until you enable the analog
expander option in the User Selectable Options setup (see Section 4.12). If this
option is enabled, communications will be successful whether or not the analog
expander outputs operate.
SELECT
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