47
2020/09
Diagnostics
This module has the following diagnostic data per channel:
“Module bus voltage warning”
Monitoring of the external power supply to the system U
sys
= 24 VDC. The system supply is trans-
formed (24 VDC => 5 V).
”No field voltage”
Monitoring of the external power supply to the field
6.5.3 Base modules
Base modules with power supply to the gateway:
with tension clamp connection
BL20-P3T-SBB
BL20-P4T-SBBC
with screw connection
BL20-P3S-SBB
BL20-P4S-SBBC
Base modules without power supply to the gateway:
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
- - - - - No field voltage - Module bus
voltage
warning
Fig. 40: BL20-P3T-SBB with gateway power supply
Fig. 41: BL20-P4T-SBBC-B without gateway power supply
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