5 DeviceNet Operation
45
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
5.1.5 Check Module Status
Check the status if the Mini-Convectron Module will not read pressure due to a fault (alarm).
5.2 Process Control Relays
The module has two single-pole double-throw (normally open/normally closed) relays. Each relay
has a programmable activation direction and trip point. The trip point is a value representing pressure
at which the relay activates.
• When the module is shipped from the factory, relay trip points are out of range, disabled, and
will not operate.
• You must configure relays to make them operable.
In default mode, trip point relays activate with decreasing pressure and deactivate at a higher
pressure than the activation pressure, as illustrated in Figure 5-2.
You can reverse the relay polarity, so trip point relays activate with increasing pressure and
deactivate at a lower pressure than the activation pressure, as illustrated in Figure 5-3.
• You may change the deactivation pressure by entering REAL data that represents hysteresis as a
percentage of the activation pressure.
• Valid hysteresis values are any activation pressure percentage, from 5% to 100%, that is divisible
by 5.
See Figure 5-2, Figure 5-3, and Table 5-11 to configure the trip point relays.
You may use explicit messages to perform the following tasks:
• Setting or getting relay trip points
• Setting or getting relay activation direction (polarity)
• Setting or getting relay hysteresis
• Setting or getting disabled/enabled state of relays
Table 5-10 Checking the Mini-Convectron Module Status
Parameter Service Class Instance Attribute Data
Check Status 0E
hex
31
hex
107
hex
Unassigned integer, 1 byte
Figure 5-1
Series 275 DeviceNet Mini-Convectron
Process Control Relay Connector
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