You manipulate the analog backplane relays after setting the pole setting by using the
channel.setbackplane() function for channels. For channels, as the pole setting changes, their
analog backplane relays, specified by channel.setbackplane(), get cleared. Therefore, after a
pole setting change, you need to add the analog backplane relays for the pole setting by using
channel.setbackplane().
When clearing the backplane channels, this can involve clearing the paired channel, whether pairing
or unpairing channels. For example, on a 40-channel card, channels 1 and 21 are paired when the
pole setting for channel 1 is set to 4. Therefore, when changing the pole setting on channel 1 to 4, the
backplane channels for channels 1 and 21 are cleared. Likewise, they both are cleared when the pole
setting is set back to 2 on channel 1.
Calling this function on an existing channel involved in scanning invalidates the existing scan list.
An error message is generated for the following reasons:
• An empty parameter string is specified.
• The value parameter is an invalid setting for the specified channel.
• The value parameter is invalid for command – parameter out of range error.
• A channel pattern or analog backplane relay was specified.
Command processing stops as soon as an error is detected and no pole settings are modified.
Example 1
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